Continuity mistake: At Skull Rock, after the crocodile has nipped off a good bit of Hook's clothing, right sock and shoe, when Hook rushes toward Smee in the boat the crocodile opens his mouth, and just as he swallows Hook he's nearly fully clothed and wearing both socks and both shoes.
Continuity mistake: When Peter and the Darling children land on the minute hand of Big Ben's clockface, in the first shot it's 8:15, note the hour hand is at the eight directly opposite the number two, but a few shots later when they fly off towards the sky note the hour hand is directly opposite the number one, which means it's 7:15. (00:19:40)
Continuity mistake: After the mermaids splash Wendy with a ton of water, her hair is wet and you can tell because it is sort of hanging down and drooping. Then they cut away, then when they cut back to Wendy, her hair is perfectly dry. (00:37:55)
Continuity mistake: In the mermaid scene, Wendy lands on a rock barely large enough to stand on. A few moments later, when she's being splashed by the mermaids, the rock has expanded to about four times its original size, and a seashell has miraculously appeared on it.
Continuity mistake: In the beginning of the movie, when John and Michael are fighting, John has a red bandana tied around his head. When they all rush over to Nana the bandana is gone. Right after that, when he is in bed the bandana is back on him and his mother takes it off.
Continuity mistake: When Tinkerbell is about to ruin Wendy's reflection, she doesn't have one. Later, when the fish is snapping at her she doesn't have one either, but even later in the movie, she has one.
Continuity mistake: As Wendy is singing 'Your mother and mine' she lays Michael down. As she is laying him down, her nightgown turns white. The next time you see her, her nightgown is blue again.