Tim is taking the trash out and John drives up to speak with Savannah who is not home.
Tim reaches into the trash and gives John a scrap of paper to write a message on to leave for her, and a pen also magically appears.
There is a typo in the end credits.
In the Special Thanks section it reads "United States Mint And Its' Philadelphia Facility" John's rank throughout the movie is that of an E-5 (SGT), yet all of the letters use the rank of E-6 (SSG).
It isn't until he returns home after his father suffers a stroke is he an E-6.
In one scene of John in his room when he's at war, it is around September 11, 2001.
They have a poster on the wall of a Bud Light beer bottle, and it says Drinkability on it.
But the term "drinkability" wasn't actually used by Bud Light until recently.
During the climatic dinner scene with Savanna after returning for his father's funeral, John is wearing his staff sergeant rank on his shoulder epaulets upside down.
(The rocker should be furthest from his neck).
Halfway through the scene, it shifts to the correct positioning, and then when he leaves, it is incorrect again.
This is the only time the rank on his uniform is applied incorrectly.
When John runs up behind Savannah in the sand and sits down her legs are straight, when it cuts to a different angle when John sits down her legs are crossed.
In a few early scenes when John and Savannah are hanging out, it's supposed to be 2001 but Savannah is wearing skinny jeans, which only became popular again (from the 1950s or so) at the end of the decade.
The watch John wore in the movie (Suunto X9i) is very popular in the military for it's GPS capabilities.
The first time John can be seen wearing this watch is in scenes from 2001, however this product was not produced until late 2006.
When the town of Worcester is mentioned in the film, the subtitles misspell it "Wooster", which is how the name is pronounced.
Where John fire his weapon at a terrorist, the view of his weapon changes from a M4 to a M249 SAW and back to an M4.
The postman places John's letters to Savannah in the P.
Box from the front.
The front of these boxes has a combination lock that is meant for the box-holder to use.
Mail is placed in these boxes from the open backs of the boxes.
When John takes Savannah home to meet his father, and she puts on the glove to look at the coins, she puts it on her left hand.
Then, later on when she speaks to John, she has the glove on her right hand.
After his father's funeral, when John is at Savannah's house and he's listening to her talking on the phone, his rank is upside down on his shoulders.
A soldier would never put them on his uniform incorrectly.
Later they are on his uniform the correct way.
When John comes home on leave for the first time, and they are at the party, Savannah's friend offers John a drink.
The drink repeatedly switches from his left hand to his right between shots.
When John is sitting behind Savannah on the beach and says, "I know that," hair is blowing in Savannah's face; the camera cuts to him pulling her close and the hair is back in place.
When John is making his own fire talking to Randy, at the beach house just before Savannah comes the same girl in short jeans with blue towel on shoulder passes in front of the camera twice.
