Fred Jones middle name is revealed in this movie: Herman.
When the Mystery Machine doesn't appear, the gang's rental has the same color scheme. Daphne's bikini and surfboard have a similar pattern with different colors.
Tia Carrere, the voice of Snooki, later appeared in Scooby-Doo! Mystery Incorporated (2010) as the voice of recurring character Judy Reeves.
Daphne surfs "goofy footed", i.e. with her left foot at the back of the board. This is unusual for a right handed person. Shaggy also favors this stance but sometimes just stands on the board both feet close together, particularly when Scooby-Doo is steering. Interestingly, the Wiki-Tiki switches between surfing stances at different points in the chase.