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- Mystery Inc.
- Don Knotts (single appearance)
- Sheriff Dandy Griffith (single appearance)
Monsters and other villains:
- Laurel and Hardy (mentioned)
Food and drinks:
- Mystery Machine
- Police motorcycle
- Gene Haultrey's convertible
|Sheriff Dandy Griffith||He was the only other person in the police station when the scary laughing was heard.|
|Gene Haultrey||A "sorehead", as Don called him.|
|Gene Haultrey as the Skeleton Man||To steal cattle.|
|Casey Kasem||Shaggy Rogers|
|Frank Welker|| Fred Jones|
Sheriff Dandy Griffith
|Heather North||Daphne Blake|
|Nicole Jaffe||Velma Dinkley|
|Michael Bell||Gene Haultrey|
- This is the second and last appearance of Don Knotts, but unlike Guess Who's Knott Coming to Dinner, it's truly him, instead of the ambiguity of another character.
- There are a few references to The Andy Griffith Show:
- Fred and Velma do an impersonation of Laurel and Hardy when they try to get the sheriff to laugh; they were incidently in the next episode, The Ghost of Bigfoot.
Animation mistakes and/or technical glitches
Inconsistencies/continuity errors and/or goofs/oddities
- Although Don had met the gang previously in Guess Who's Knott Coming to Dinner, the gang and Don don't know each other; although if Homer Pipsqueak isn't intended to be Don then they wouldn't recognize each other.
In other languages
|Greek||Η Ύποπτη Ομίχλη||The Suspecious Fog|
Don Knotts: You're coming with me, Haultrey!
|Previous episode:||Series:||Next episode:|
|The Secret of Shark Island|| The New Scooby-Doo Movies|
|The Ghost of Bigfoot|