Moon

In the scene where Sam is wearing the yellow jumpsuit, the height of the zipper changes numerous times.

The wire running to Sam Rockwell's microphone is visible several times through his t-shirt.

Sam realizes that he has lost a tooth when feeling around in his lower jaw.

However, the tooth that he pulls out of the toilet has three roots, meaning that it is a maxillary (upper) molar.

Mandibular (lower) molars only have two roots.

In the scene when Sam is working on his model and the other "Sam" is banging a ping pong against the wall, he lays his racket on the table.

A few shots later a small wooden house appears beside the racket, that no one put there.

When Sam is marking his "time" with the faces in dry-erase marker, you can see the outlines where previous dry-erase marker has been wiped away, leaving a negative image of the smiley face in its stead.

However the base is "reset" and previous markings wiped away at the end of each "shift", so these residual markings are likely if not expected.

When Sam first launches a full canister of helium-3 back to Earth, he repeatedly hits two keys at a time while punching in the launch code.

In some scenes outside the station the dust moves as if there was an earth-like atmosphere.

There are many shots outside the station where sunlight and stars are visible at the same time.

Even without an atmosphere this is not possible because the contrast between the bright ground and the dark sky is too high.

When the dying Sam gets up to the alarm clock he picks up a tissue to wipe his nose, but before he blows his nose we can see that the tissue is red.

The hook for the crane on the second rover can be seen swinging back and forth rigorously.

The hook would behave quite differently in the low gravity environment.

Helium is an inert gas and does not participate in chemical reactions.

However, it can participate in nuclear fusion.

The isotope helium-3 is particularly interesting to fusion researchers, and is more abundant on the Moon than Earth.

When the two Sam clones are going to put the first clone back into the crashed Rover, the second clone puts the first clones helmet on and we can see that the visor is dusty and bloody.

In the next scenes the visor is spotlessly clean.

When Sam first enters the rover to go to the harvester, a 12" square apparatus is visible near the door of the rover, then it disappears.

The final time Sam tries to log on to the computer (before Gerty does it for him), the "Access Denied" voice chimes in before he is finished typing in the password.

After Sam crashed with his Moon Rover, he has a wound near his right eye.

In the following scene, when he puts his helmet back on, the wound is near his left eye.

Much later, when he's back at the base, it's back on his right side again.

In the scene where the two Sams are in the "secret room", the hammer, the first Sam threw down previously, disappears shortly before the second Sam climbs the ladder back up.

(at around 25 mins) When the two Sams are looking for the towers, the interior of Rover #3 shows hanging fuzzy dice.

These dice are actually from the crashed Rover #1, and are still there in the ending shots.

Sam and Overmeyers both say "over and out" at the end of transmissions.

While this is procedurally incorrect ("over" means "waiting for your response" and "out" means "ending transmission"), most people don't know any better.

The mug on Gerty's cup holder appears and disappears throughout the film.

Sam leaves his mug on top of the "Mark" terminal at the start of Gerty's first scene, for example, yet it is on the cup holder as he walks down the corridor.

After Sam makes a call to his daughter we can see his vehicle and Earth above horizon in one shot.

This may seem a goof, since base is supposed to be on the far side of the Moon, which is invisible from Earth and vice versa.

However, Sam needs to get far from the jammers to be able to call Earth; explaining why he is on the other side of the moon.

The fuzzy dice in the rover hanging in the cockpit hang and sway as if affected by Earth gravity, not that of the Moon.

When first Sam has fallen asleep and begins to dream about his wife, the "Take Off" magazine on the shelf beside his bed is facing away from him.

When he wakes up, the magazine has been turned around 180 degrees.

As Sam enters the code to access video files, a quick shot of the keyboard shows that he is only addressing keys on the home-row (and alternatively hitting the 'j' and 'k' keys).

Although a password may consist of just these keys, it is highly improbable.

Also, the characters appear on the monitor before he has a chance to type them.

In the original cinema release, 'Sam Rockwell' (qv) is clearly wearing a flesh-colored thong during the scene where he is showering.

This error is fixed in the DVD cut of the film.

After the fight scene, when second Sam drops first Sam out of the headlock, the first Sam places his right hand on the ground, and it does not have the bandage that he was wearing moments before.

Seconds later it's back again.

Before the drop first Sam's palm full of blood can clearly be seen, before he brings his hand to his nose, and his nose is not bloody until he does.

As Sam first enters the rover early in the film, the Lunar Industries logo and text on the bulkhead below the hatch is backwards, indicated the shot has been horizontally flipped.

When Sam is watching the video message from his wife Tess and young daughter Eve, the boom mic operator intrudes into the right of the frame a few times.

As revealed in the DVD commentary with director Duncan Jones and producer Stuart Fenegan, the close-ups of GERTY are in fact a prop and the wide shots are post-production CGI inserts.

It's clearly visible that the CGI GERTY doesn't have the splashed coffee stains down his right side above the mug holder.

A member of crew is visible on the shiny metallic surface after Sam throws up at the toilet and leans against the wall.

When Sam first approaches his clone while the clone is jumping rope, he has his baseball cap's bill toward the front.

Then the camera cuts to a rear view and the hat is backwards.

When the camera returns to the front view, his hat is forward again.

When the two Sam clones are going to put the first clone back into the crashed Rover, the Rovers are both facing front-end outwards in the bay.

However, when the injured clone drove back after locating the aerials, he drove in front first, while the other clone reversed in.

So the Rovers should be facing different directions.

- PLOTWhen second Sam gets into the helium canister launching pod he doesn't have to press any buttons to close the door on the pod, or type in the code to launch it.

GERTY can't do this because Sam rebooted GERTY.

The last time we see Sam Bell in the pod (shouting "whoohooo!") the pod is clearly rumbling and shaking.

This can either be vibration of the engines or by reentering the atmosphere.

But the shot directly before shows the engines turning off and earth's atmosphere is still far away.

In that situation there's nothing that could rumble or shake the pod.

When GERTY tells Sam he can't go outside, and at the first Eliza transmission, the computer monitor reads "sattelite link lost" (with "satellite" misspelled).

The environment suits continue to drape loosely while being worn outside.

A real environment suit would appear inflated and rigid.

However, sci-fi future technology could account for a more advanced, non-rigid spacesuit.

When Sam makes a phone call to his daughter, there is no noticeable lag time between responses.

Radio transmissions take about three seconds to make the half million mile round trip from Earth to the Moon or vice versa.

When Sam takes two food boxes from the top of the pile, while talking to the other Sam, the scene cuts in close, and when it cuts back out, the two boxes at the top of the pile have been replaced.

They are harvesting H3 on the far side of the moon, but a few times the Earth can be seen in the sky near the base.

Since the moon does not rotate (relative to earth) there is one side where the Earth is always above the horizon (the side facing earth) and one side where the moon is always below the horizon (the side that points away).

The Earth cannot be seen from any part of the far side.

The Earth is always below your feet.

When Sam is walking outside it looks like the moon's gravity.

But inside he moves normally, although his weight should be only one sixth, assuming there is no sort of 'artificial gravity' being used/supplied in the indoor areas.

Furthermore, a game of table tennis would look very different under the gravity of the moon.

In the 2nd part of the movie, when Sam is outside, one can hear the heavy sound of the machinery.

There is no air on the Moon, and thus we shouldn't be able to hear the machinery.

- PLOTWhen the two Sams find the "secret room", they enter and leave using a hidden ladder.

They use that same ladder to take out another clone, to use on their plot to escape.

How does GERTY get the clones out of the nursery? When the two Sams first climb down to the secret room, one Sam is in the room hanging on to the ladder.

The second Sam climbs down and his foot goes through the other Sam's arm.

When the younger Sam is looking for the secret door, he gets in a fight with the older Sam and eventually flips over his "model" of his hometown.

The model is destroyed.

However, a few scenes later when the younger Sam is apologizing to the older Sam, the model is not destroyed and clearly visible in the background.

The narration in the opening minutes states that the base is located on the "dark side of the moon".

There is no "dark side of the moon"all "sides" of the moon receive the same amount of sunlight per lunar day.

It's obviously put in to explain why a relay transmitter would be required to contact Earth, since there is a direct line-of-sight transmission available every single lunar day.