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Insert details here.
- Ollie (single appearance)(no lines)
- Bast (single appearance)(picture)
- Cats (single appearance)(no lines)
- Bobby (final appearance)(no lines)
- The Mystery Machine (mentioned)
|Old woman||She's strange and had a jar of ancient Egyptian catnip.|
|Assistant||The antique dealer thought he could be smarter than he acted.|
|Antique dealer as the Cat Mummy||To get back a stolen ruby that was inside a cat statue.|
|Frank Welker|| Scooby-Doo|
|Matthew Lillard||Shaggy Rogers|
|Grey Griffin|| Daphne Blake|
|Kate Micucci||Velma Dinkley|
|J.B. Blanc||Antique dealer|
- Fred announces the guest star in the title card.
- The antique dealer bears a strong resemblance to Professor Jameson Hyde White from the Scooby-Doo, Where Are You! episode What a Night for a Knight.
- Ricky Gervais was "flattered" to voice himself in this episode.
- The title is named after the catchphrase "Olly olly oxen free."
- Ollie is based on the real-life cat of Ricky Gervais.
- When Ricky Gervais says "Well Ollie, that's another fine mess you've gotten me into" he is referencing 1930's comedian and film star Oliver Hardy's catchphrase, blaming his partner Stan Laurel for their current on-screen predicament. The gang met the pair in The New Scooby-Doo Movies episode The Ghost of Bigfoot.
- Gervais mentions Bugs Bunny's catchphrase "What's up, doc?" when talking to Scooby.
Animation mistakes and/or technical glitches
- None known.
Inconsistencies/continuity errors and/or goofs/oddities
- None known.
Shaggy: Yeah, like dude. Was there supposed to be funny? I don't think it was funny!
Fred: Strange old woman.
Ricky Gervais: All you have your own little catchphrases, don't you? Like Daphne's got "Jeepers", Velma has "Jinkies", Shaggy "Zoinks", right. Even Fred says "Hold the phone".
Fred: I told ya. You should have let me do the ropes.
- ↑ Harris, Niomi (October 21, 2019). ["Ricky Gervais reveals he was 'flattered' to be asked to play an 'exaggerated and twisted version' of himself in the new Scooby-Doo TV series"]. Mail Online. Retrieved October 22, 2019.