During the tour of the Marine biology lab, London's bag moves from her left arm to her right hand, then back.
In the scene where Woody tells Cody that he can fart "Stairway To Heaven", Cody says "Stairway To Heaven" is a 10 minute song. "Stairway To Heaven" is actually an 8 minute song.
After Bailey, Zack, Cody, and London fall "overboard" into a hot tub. If you look carefully you can see Bailey taking off her hat revealing she's really a girl.