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- Mystery Inc.
- Phyllis Diller (single appearance)
- Magic Mansion Phantoms (single appearance)(disguise)/
- Alberto (single appearance)
- Alberto's accomplice
- Gargoyle (Alberto or his accomplice) (single appearance)(no lines)(disguise)
- Phyllis Diller's poodle (single appearance)(no lines)
- Guard (single appearance)
- Bridge operator (single appearance)
- Phyllis Diller's neighbor (single appearance)
- Cat (single appearance)(no lines)
- Police officer (single appearance)(no lines)
|Lucas||Strange manner. Took an interest on Phyllis Diller's jewels.|
|Mysto||Acted suspiciously. Also took an interest on Phyllis Diller's jewels.|
|Alberto||Suspicous manner. Also took an interest on Phyllis Diller's jewels.|
|Madame Zokar||Supposedly called out the spirit of Phyllis Diller's first husband which revealed the location of her jewels.|
|Alberto and his accomplice as the Magic Mansion Phantoms||To steal Phyllis Diller's jewels.|
|Don Messick|| Scooby-Doo|
|Casey Kasem||Shaggy Rogers|
|Frank Welker||Fred Jones|
|Heather North||Daphne Blake|
|Nicole Jaffe||Velma Dinkley|
|John Stephenson|| Mysto|
|Joan Gerber||Madame Zokar|
The following credits are how they are seen on-screen (or as close as possible).
- Produced and Directed: William Hanna and Joseph Barbera
- Associate Producer: Alex Lovy
- Story: Jameson Brewer, Tom Dagenais, Ruth Flippen, Fred Freiberger, Willie Gilbert, Bill Lutz, Larry Markes, Norman Maurer, Jack Mendelsohn, Ray Parker, Gene Thompson, Paul West, Harry Winkler
- Story Direction: Steve Clark, Mike Kawaguchi, Paul Sommer, Carl Fallberg, George Singer, Irv Spector, Howard Swift
- Voices: Nicole Jaffe, Don Messick, Frank Welker, Daws Butler, Joan Gerber, Larry Harmon, Ann Jillian, Jim MacGeorge, Mike Road, Vincent VanPatten, Casey Kasem, Heather North, John Stephenson, Henry Cordon, Florence Halop, Pat Harrington, Ted Knight, Cindy Putman, Olan Soulé, Len Weinrib
- Animation Director: Charles A. Nichols
- Production Design: Iwao Takamoto
- Production Supervisor: Victor O. Schipek
- Layout: Bob Singer, John Ahern, Mike Arens, Ric Gonzalez, Alex Ignatiev, Ray Jacobs, Bill Lignate, Alvaro Arce, Mo Gollub, Paul Gruwett, Zygamond Jablecki, Herb Johnson, Lew Ott
- Animation: Bill Keil, Ed Aardal, Lefty Callahan, Goerge Cannata, Izzy Ellis, John Garling, Fred Grable, Joan Orbison, Jay Sarbry, Irv Spence, Carlo Vinci, Ed Barge, Lars Calonius, Rudy Cataldi, Hugh Fraser, Bob Goe, Dick Lundy, Ed Parks, Ken Southworth, Dave Tendlar, Xenia
- Backgrounds: F. Montelaegre, Gary Niblett, Dave High
- Titles: Iraj Paran
- Musical Director: Hoyt Curtin
- Musical Supervision: Paul DeKorte
- Technical Supervisor: Frank Paiker
- Ink and Paint Supervisor: Jayne Barbera
- Xerography: Robert ‘Tiger’ West
- Sound Direction: Richard Olson, Bill Getty
- Supervising Film Editor: Larry Cowan
- Film Editors: Earl Bennet, Ron Sawade, Pat Foley
- Negative Consultant: William E. DeBoer
- Post Production: Joed Eaton
- Camera: George Epperson, John Aardal, Dennis Weaver, Ralph Migliori
- A Hanna-Barbera Production
- RCA Sound Recording
- © 1972 Hanna-Barbera Productions, Inc.
- a hanna-barbera production
- The episode is a pun on how one can cook meat, usually steak.
- Phyllis Diller was actually married two times, to Sherwood Diller (m. 1939-1965), and Warde Donovan (m. 1965-1975). She was married to her second husband when she appeared in this episode.
- Ms. Diller passed away on August 20, 2012.
Animation mistakes and/or technical glitches
- Shaggy's shirt is colored grey and his neck as Daphne's hair when the mYstery Machine drives to the Magic Mansion.
- Shaggy and Scooby try to squeeze in the Mystery Machine from its closed door when the shot is from the inside.
- Also when Shaggy gets scared by the giant spider on the wheel, his head goes through the car roof.
Inconsistencies/continuity errors and/or goofs/oddities
- It was never revealed who the Gargoyle was.
In other languages
|Hungarian||Ritka a jó médium||A Good Medium is Rare|
- Due to most likely expensive royalties owed to Ms. Diller (her estate as of 2012) in lending her likeness and voice to a fictionalised version of herself, Warner Home Video are unable to release this episode onto DVD.
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|Guess Who's Knott Coming to Dinner|| The New Scooby-Doo Movies|
|Sandy Duncan's Jekyll and Hyde|