Kathryn Beaumont was originally suggested to play adult Wendy, since she played young Wendy in the original Peter Pan (1953).
The Lost Boys' names, never spoken in Peter Pan (1953), are revealed in this film: Slightly (Fox Costume), Nibs (Rabbit Costume), The Twins (Raccoon Costumes), Cubby (Bear Costume) and Toodles (Skunk Costume). They come from J.M. Barrie's writings.
Because most of the original Peter Pan (1953) voice cast of the movie had died, including Hans Conried (Hook) and Bobby Driscoll (Peter Pan), an entirely new cast of actors had to be used to film this sequel. Among them is the prolific and versatile actor Corey Burton, who was not only a big fan and admirer of Hans Conried but also a student of his. Burton does a dead-on impression of Conried and, as he says, gives the illusion that Conried is present.
Though most voices of returning characters closely imitate the voices from Peter Pan (1953), the voice of Cubby (the Lost Boy in a bear suit) is noticeably different. Child actor Spencer Breslin gives him a high pitched voice rather than his deep, funny "oafish" voice done by an adult male from the original and his other appearances (aside from his cameo in Chip 'n Dale: Rescue Rangers (2022)).
When the ship is traveling to Neverland through the portal, voices from the original Peter Pan (1953) can be heard.