Other mistake: At Skull Rock, when Peter Pan mimics Captain Hook's voice while talking to Smee, just as he says, "Oh, and one more thing," note the handle of Peter's dagger. The animation of his dagger is bizarre, the handle's grip is separated from its pommel, as if it's going through Peter's forearm. (00:41:50)
Other mistake: During Dorothy's and the detective's date, they are outside while the boat is moving, yet there is no wind blowing around. Since the ship is moving there should be wing blowing past the two.