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This is the direct adaptation of Erle Stanley Gardner's 1952 novel, ''The Case of the Grinning Gorilla". Most PM episodes were original screenplays 'based on characters created by...', but this is an actual ESG novel.
True Boardman makes his only acting appearance here on Perry playing the morgue attendant. Not only was True Boardman his real name, his father was also named True Boardman. True Boardman began his acting career at the age of 3 in 1912, and this was his first appearance since 1936. True Boardman is best known as a writer. At the time of this broadcast, he had already written two episodes of Perry, TCOT Ancient Romeo, and TCOT Lawful Lazarus. Submitted by PaulDrake 33, 18 August 2009.
Lurene Tuttle makes her fifth of six appearances here as Miss Kempton. She was one of the great character actresses in films of the day, and a great favorite of Raymond Burr's She made memorable appearances in "Psycho" , "The Fortune Cookie" , and in the short-lived CBS sitcom "Father of the Bride"  She was wonderful in TCOT Substitute Face, from Season 2.
And Gavin MacLeod, whom millions remember as the Captain of "The Love Boat" in the 1970s.
As well as Murray Slaughter from "The Mary Tyler Moore Show".
Robert Colbert played Dr. Doug Phillips on "The Time Tunnel" SCI FI Classic from 1966-67. Mike Bedard 2.4.15
Uncredited Actors: Don Anderson is in uniform once again as a Sheriff’s deputy. I think he’s one of the men who hurry past Mason and his client as they escape the gorilla, and he’s definitely the deputy who steps out beside Paul Drake after overhearing the blurted confession of Fallon and Hershey. Submitted by FredK, 2 December 2010.
It’s quite a conincidence that bon vivant Victor Buono should play the personal assistant to a kooky anthropologist when later in Batman he would play an anthropologist himself—one who was hit on the head and thought himself King Tut reincarnated. Submitted by gracenote, 5/4/2011.
Sightings: As Perry grumpily requests Della to carry her own packages in the opening scene, a hatted Distinguished Gentleman (whom we’ve designated as #1) pops out of the phone booth. Submitted by gracenote, 5/4/2011.
Once again, Ray Collins receives billing for Lt. Tragg but makes no appearance. Submitted by gracenote, 5/5/2011.
Murder Method: Of approximately 34 victims that died by stabbing, Benjamin Addicks was the third known to have been killed with scissors (165 and 193). In many of the stories the instrument wasn't identified. Submitted by H. Mason 5/2/15
This is the only credited PM appearance for Hungarian-born Janos Prohaska, who made a career performing inside animal suits, such as the gorilla in this episode...MikeM. 3/1/2017