Continuity: The position of Samantha's guitar strap changes as she is singing her song in the recording booth. It jumps off of her shoulder between shots as well.
Continuity: In the opening shots we see Chris writing in Jamie's yearbook. However between shots it is evident that the handwriting has changed position and style.
Revealing: When Chris and Jamie are on their day date in the diner, Jamie has a grilled cheese sandwich with ranch on the side. However it is obvious that the bowl of ranch is empty.
Revealing: When we first see Dusty (when he is Dusty Lee) playing the guitar in the Palomino House, it is impossible for him to be playing what is heard. If you listen, you will hear that it takes two guitars to play what he is playing on one.
Continuity: When Samantha is sitting at the foot of the bed with an ice pack on her head, eating toothpaste, in one shot she spits some toothpaste out and it goes over Chris' hand. In the next shot his hand is clean.
Continuity: When Chris and Jamie are on their day-date in the diner, Chris is holding a fork as he talks to Jamie. The direction of which the tines on the fork point changes between shots.
Continuity: After Samantha jumps on Chris and undoes his trousers, she runs to the other couch and plays her song. As she sings it the magazines on the table in between them change between each shot.
Continuity: When Ted is talking to Chris in The Maple Tavern, he is drinking a beer. The foam on top of the beer keeps disappearing and reappearing between shots.
Continuity: Chris walks out of the elevator with another worker, who is holding a pile of presents. Betweens shots an extra present appears on the pile, so Chris can pick it up and give it to Francine.
Continuity: After Chris puts the 'Shakes come and go but friends are furrr-ever' tee-shirt on, the position of the black collar sticking out from the tee underneath keeps changing.
Other: When Chris and Jamie are sitting on Jamie's bed, Tim comes in and shoves Chris onto the floor. This is supposed to be when the yearbooks are switched, but if you watch closely you will notice that Tim leaves with the same yearbook he brought in.
Audio problem: In the bar after Chris sees Jamie, she says, "Wow! Your arms, and your belly, and pecks! Chris Brander." After Chris laughs while she's telling him that his mouth is moving but he isn't saying anything.
Continuity: When Chris is at the recording studio with Samantha, when Samantha runs and jumps onto Chris, the position of her belt changes a few times from tight to loose.
Revealing: After the group of four see "The Notebook", when Jamie, Chris and his mom are watching the home videos of Chris and Jamie, the latex makeup is starting to peel off Chris's face.