Frank Welker provides the voice of Scooby-Doo as a baby in the film, making this his de-facto debut as the character. He originally auditioned for the voice of Scooby in Scooby Doo, Where Are You! (1969) and would go on to fully assume the role from What's New, Scooby-Doo? (2002) onwards.
The only Scooby-Doo feature released after the release of Scooby-Doo and Scrappy-Doo (1979) not to feature Scrappy-Doo, who would feature regularly up until and including Scooby-Doo and the Reluctant Werewolf (1988). The theme tune to Scooby-Doo and Scrappy-Doo (1979) is however used over the end credits. It is possible that as this aired during the debut of Scrappy-Doos' first season that a decision had yet to be made on whether to continue with the character pending feedback. It is also worth noting that Lennie Weinrib - who had been a regular Scooby-Doo voice actor prior to Scrappy's introduction - is absent from the voice cast which could imply he had already left the show and the character was yet to be recast.
This is the first known film in the entire ''Scooby-Doo'' franchise, and the only instance where Scooby and the gang do not face off against a real villain of some sort. The members of Mystery, Inc. are shown to be actors in a television program.
This special sees the return of Patricia Stevens as Velma, who was no longer voicing her on Scooby-Doo and Scrappy-Doo (1979) at the time this special aired (she had been replaced from episodes airing from December 8 1979 onward by Marla Frumkin).
Cherie appears to be a mash-up of Cher and Marie Osmond. Cher had teamed up with Mystery Inc. in The Secret of Shark Island (1972).