Other mistake: In one of the beginning scenes, when Noah and Fin are at the fair, you see Allie and Sarah on the bumper cars. Allie bumps into Sarah, and you can see and hear Sarah yell "Rachel," which is actually the name of the actress who plays Allie - Rachel McAdams. (00:05:20)
Audio problem: When Noah and Martha exit the "dream house", Allie's head does not move (she looks down all the time), nor do her lips move while she pronounces parting words to Martha.
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Noah: My Dearest Allie. I couldn't sleep last night because I know that it's over between us. I'm not bitter any more, because I know that what we had was real. And if in some distant place in the future we see each other in our new lives, I'll smile at you with joy and remember how we spent the summer beneath the trees, learning from each other and growing in love. The best love is the kind that awakens the soul and makes us reach for more, that plants a fire in our hearts and brings peace to our minds, and that's what you've given me. That's what I hope to give to you forever. I love you. I'll be seeing you. Noah.
Trivia: When Noah is driving back to Allie's house after Finn tells him she's left, Noah's car bangs into the fence. This wasn't supposed to happen; it was a mistake made by the actor (Ryan Gosling).
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