Corrected entry: When they do the scene with the music video, Neal's lips don't match what he's singing.
Corrected entry: In the last scene Ray is dancing on stage with her ballerina friends and also onstage the English guy is singing Molly's Dad's song. They cut back and forth to Ray, Molly and the guy singing. At the end the audience rises to give Ray a standing Ovation and you can see the English Guy has stopped singing onstage, but the song is still playing as though he were singing.
Corrected entry: In the scene where Neil is supposedly singing and playing the guitar at Ray's recital, he is actually lip-syncing. At the end of the scene where everyone is clapping, even though you can still hear a guitar and a voice, his lips are not moving and his hands are not on his guitar.
Corrected entry: Molly's electricity was cut off. Her friend comes into her apartment and says that she has 95 new messages, and Molly asks her to write them down, meaning that it was an answering machine. But wait, how could her answering machine be on if she had no electricity? And we find out seconds later that the phone line was also dead.