Continuity mistake: After Hook swims away, Wendy asks Peter where are they going to. The rope behind her swaps positions between shots.
Continuity mistake: Peter cuts Hook's hat and feather. When Hook swims away, Peter grabs the hat to impersonate Hook and the hat is fixed.
Deliberate mistake: When the kids are in the crow's nest fighting the pirates, dozens of stones and arrows fly out of nowhere, despite the kids just having a handful. Check for the kid with the blowpipe: He manages to blow dozens of rocks out of nowhere. There's even a shot where arrows and stones are flying from all over the place despite the fact that a shot later the kids are crouching.
Continuity mistake: When Nana is sent outside and holds the rope, the length of the short end increases between shots.
Continuity mistake: When Mr. Darling is getting dressed, a jar of water suddenly appears no the night table behind him.
Continuity mistake: When the movie begins and Mrs. Darling grabs a hairpin, a bottle on the table disappears between shots.
Chosen answer: He's too much of a bumbler and too cheery (for example when he tells the crew "good morning" and they wanted to know why it's so good.) They probably also see him as a fool and brown-noser since he's always trying to make Hook happy. To the crew he's just Hook's assistant and not a real pirate at heart.
Bishop73