When Jake uses the Radio Bone, it's receiver is that of Ansabone instead of the one that's in Ghost Buggy.
Apparitia says she is watching Groovie Goolies (1970), but the character Bella La Ghostly has black hair instead of blue on the view-screen. This is the re purposed character model as seen in The Girl Who Cried Vampire (1986) instead of the original.
When Apparitia disappears when leaving the submarine, the submarine control levers disappear with her, indicating that the animators simply removed the cel without noticing that they had removed the levers.