This is the first film in the DisneyToon Studios film library to receive a PG rating from the MPAA. Additionally, it is, to date, the only direct-to-video animated Disney sequel to receive that rating.
David wears a fishhook necklace. The fishhook is similar to the one used by Maui in Moana (2016). Since Maui is very prominent in Hawaiian culture, it's conceivable that the fishhook David wears is a representation of Maui's hook and is worn as a good luck charm.