Continuity mistake: When Max and Liz are talking about the basketball game in front of Max's locker, Max shuts his locker door twice. (00:08:25)
Continuity mistake: As Max and his mother are talking in the park she asks him about finding his real parents. She takes her hand off his shoulder and crosses her arms, but in the next shot her hand is back on his shoulder. (00:37:30)
Answer: It's called "Here With Me", performed by Dido. It can be found on her album "No Angel".
Tailkinker ★