Continuity mistake: When Hook has Wendy tell him the story of Peter Pan a pirate says, "I need a Wendy," and Hook shoots him. Then Smee says, "Very exciting. Two dead already," Hook does not put the gun away in the background, yet in the next shot he has no gun in his hand. (01:18:15)
Continuity mistake: The dirty smudges all over Peter's body either disappear altogether or change shape, position and/or shade in consecutive shots. For example, the smudges at Peter's left ear or just under his neck change while in the Darling nursery. (00:15:35)
Continuity mistake: When Hook slices Peter at the Black Castle, we see very that Hook cuts Peter directly below the jugular notch at the neck. Yet in the following shots the cut is shown to be far below the original cut made nor does it have the same appearance within those shots as well. (00:50:25)
Deliberate mistake: Hook tells Peter, "She'd rather grow up than stay with you," and we see that this next wide shot is flipped, note the hook on the left hand. Also, as Hook smacks Peter across his face and sends Peter hurling into the rigging with a bleeding forehead, dramatic as that is Hook doesn't even make contact with Peter in the shot. (01:26:25)
Continuity mistake: In the nursery, John shouts, "I've got it! I've got it!" then runs to his bed and visible on the left are clothes that hang from the tri-fold screen which stands near John's bed. In the close-up of John's feet, as he runs on his bed to try and fly, one set of clothes from the previous shot is gone. When he lands on the floor, there is yet another set of clothes that hang under the outfit with the white ruffle as well and then as John flies out the window still another set appears. (00:21:30)
Revealing mistake: When Peter flies into the nursery searching for his shadow, he follows Tink into the hallway. The red window draperies fit the width of the hall in this and other shots. However, in the close-up after Peter opens the drawer, he grabs his shadow as it flies up and the draperies are visible. In this shot, not only are the draperies much narrower, but the hallway ceiling is now much wider to allow the shadow to stretch while trying to get away. (00:13:10)
Continuity mistake: Peter, Wendy and the boys are on the cloud looking down on the Jolly Roger when Wendy comments, "She must do 12 knots under full sail." In this wide shot we see Noodler standing at the snow topped rail between the cannons. John then views Noodler in a close-up and the snow is different, there are lines lying on top of the cannons, etc. (00:29:55)
Continuity mistake: When Wendy tells her story while tied up on the Jolly Roger, there is a front close-up of Noodler who raises his 'left' hand to ask, "Was one of them pirates called Noodler?" Then there is a back shot of Noodler who is still raising his hand, but it is his 'right' hand that is raised and then moves to the front of his body. It is not the wart pirate's hand in the back shot, whose hand is on Noodler's shoulder in the next front shot. (01:18:15)
Continuity mistake: We see the outside of the Darling's house as Wendy speaks of Alf Mason's ugliness, when she looks out from her window after Nana barks, when she searches the patio with a candle, when Nana is chained outside and when Peter, at a distance, sees the Darlings leave their home for the evening, etc. Among the changes, seen in certain shots, is the house adjacent to the Darling's home and the Darling's patio's appearance and surroundings. (00:01:10 - 00:11:55)
Continuity mistake: When Aunt Millicent is speaking with Mr. and Mrs. Darling about Wendy, she is holding a wine glass with engraved etchings. The position of the markings vary when the camera faces her and when the camera faces the Darlings. (00:05:45)
Continuity mistake: After the children return, the shadows cast within the room change drastically in the following shots. For example, when the wall behind John's and Michael's beds is visible the shadows cast by items, such as the clock and light fixture, are very different throughout this last scene. (01:36:25 - 01:37:55)
Continuity mistake: When the children arrive home, John does not have a mark on his forearm. As John shakes his father's hand there is a long black mark above his wrist. During the family hug while they kneel on the floor the mark is smudged. When John is on the floor with his father and the Lost Boys, Michael dumps the treasure onto the rug and in the next shot as John holds one of the twins the mark on his forearm is long and clear now. The mark changes position as well. (01:37:15 - 01:38:55)
Continuity mistake: Hook sneaks into Peter's hideout while Peter sleeps in order to kill him. In the first close-up Hook tries to reach Peter, who's lying down, as Peter mumbles in his sleep. In Peter's second close-up he is in a completely different position as the poison drops into the water. As he wakes with a start in his third close-up, Peter is lying in the same position as the first close-up. (01:10:45)
Continuity mistake: On the Jolly Roger, after Hook tells the others, "He's mine," and Peter shouts, "Now," we see Wendy bursting through a closed door and surprising the pirates. In the next shot we see Wendy bursting through the closed door again from another angle and her hair is different in both shots. (01:24:10)
Revealing mistake: Wendy duels with Cookson, the tall pirate, at the Black Castle and slices his cheek in a close-up. The cut is actually on his cheek before the sword even touches him, though it wasn't there in earlier shots. (00:48:55)
Other mistake: In the scene where Wendy admits to being Red-Handed Jill, Tootles says "Mother and Father are fighting again" and Curly is mouthing his lines.
Revealing mistake: When Peter says "Just think happy thoughts, and they lift you into the air" he does a sort of twirl, at the beginning stage of his twirl you see the border at the top of the wall which makes the room seem way too small for him to do what he did. (00:21:20)
Revealing mistake: After receiving Wendy's real kiss aboard the Jolly Roger Peter quickly flies up and proceeds to fly back down. As he swoops down to the deck and lifts up two swords, most of the kids' eyes are not in sync with Peter's movements. (01:31:45)
Deliberate mistake: As the Darlings and the Lost Boys laugh in the nursery, the narrator says, "There could not have been a lovelier sight...except a strange boy who was staring in at the window." When the camera pans out through the window Peter's back is visible at the right of the window. This is not Jeremy Sumpter. (01:40:00)
Continuity mistake: When Wendy says, "But, there's no such thing," Peter flies to her and covers her mouth with his hand. When he says, "Don't say that." In this side shot his fingernails are relatively clean. In the next shot facing Wendy, Peter's hand is still on Wendy's mouth and his fingernails are filthy. Then back to the side shot and his fingernails are clean again. (00:19:00)
Answer: It's not that you never age, it's that you never grow up, i.e. pass into puberty and become an adult.
Myridon