If you loved The Jetsons Meet the Flintstones, try Scooby-Doo! and the Reluctant Werewolf
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

The Jetsons Meet the Flintstones
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Scooby-Doo! and the Reluctant Werewolf
What they share
Both films are directed by Ray Patterson, and they both carry the cozy, playful mood tags, and they sit in Animation / Comedy / Family / TV Movie territory. If that's the register that drew you to The Jetsons Meet the Flintstones, the second film will land in a comparable space — through a different lens.
cozyplayful
What Scooby-Doo! and the Reluctant Werewolf is
Transylvania. Autumn moon. Howling. Shaggy Rogers suffers lycanthropy. To reverse the curse, he must win a monster car race. Scooby Doo, Scrappy Doo, and Googie offer pit support. Hanna-Barbera at their most ghoulishly gearheaded.