Positions of the Snickers bars on the table during the "drinking at the boathouse" scene.
During the first "arrow roulette" scene, 'David Spade' (qv) falls face-first into a pile of poop and is completely covered.
In the next scene, he is completely clean.
In the boathouse scene you can see the boom mic above 'Adam Sandler (I)' (qv)'s head.
During the conversation in which Eric is holding the KFC bucket, the red side of the bucket is facing the camera, then after a cut-away, the white side is facing the camera, then after another cut-away, the bucket is gone.
When they're rowing across to the island, the side at which 'David Spade' (qv) is holding the oar changes as the camera changes angle.
He would not have been able to change hands as fast as that.
When 'Rob Schneider (I)' (qv) kicks 'David Spade' (qv) in the groin on the second kick he falls over in pain, but the next scene he is standing up with no pain.
When Marcus receives the call about the coach's death, his girlfriend isn't seen sleeping in the bed but when he asks about the niece of the coach, she appears.
During the water park scene, the body builder is seen to remove his sun glasses and toss them on the lounge chair.
In the next shot, they are back on his face.
In the following shot, they are back on the lounge chair where they landed when he tossed them down.
Rob fixes a vegan breakfast.
He won't allow "dead animal flesh" anywhere near the organic food.
Later, on McEntire Island, Rob is reaching in the bucket for fried chicken to eat.
The injured bird in the movie is an Eurasian Collared Dove, but when they set it free we can hear singing of a canary bird or a similar small type of bird.
While the men are rowing to the island, Eric's hands instantly change from rowing to resting on top of his head (with the oar on his lap).
When Gloria is looking at the engine (and it changes into a slo-mo steam scene), her glasses disappear.
When Robbie kicks Marcus in the groin after chasing him to the top of the boathouse, Robbie has a shoe on his right foot when he kicks Marcus.
In the next shot, when Robbie grabs his left foot in pain, he is bare-footed.
In the next shot where Robbie is on the ground still holding his left foot in pain, the shoe reappears on his right foot.
When everybody's entering the lake house for the first time, after Rob says "Welcome back to 1978," and the camera shows all of the characters, a crew member can be seen running past one of the windows on the left.
When the man from Saskatoon is flexing for the women, the towel on the chair changes color between shots.
The number 55 on the back of Eric's jersey changes width and style multiple times during the basketball game at the end.
In the basketball game at the end of the movie, the wife, baby and daughter of the guy on the opposing team who steals the dessert from his daughter are shown sitting with the daughter in the left chair (right on the screen) and the wife and baby in the other chair.
When the father steals the dessert from the daughter, they are in opposite chairs.
When you first see Donna in the pool, she's standing up in the middle of an inner tube with the American Flag design in the water.
In the next scene, she's on the other side of the pool sitting on the tube with the design facing upwards.
When they are on the zip-line, watch the crowd in the background.
It changes numbers of people impossibly quick.
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