Continuity mistake: When Calvin Q. Calculus has invented the portable hole, he says "Eureka!" and you can that there is a beaker on the desk, but in the next shot the beaker has disappeared.
The Hole Idea (1955)
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Directed by: Robert McKimson
Starring: Mel Blanc, Bea Benaderet, Robert C. Bruce
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More mistakes in The Hole Idea
Calvin Q. Calculus: I invented the portable hole for the good of humanity. But let us all hope it will never be used for evil purposes.
Trivia: When we see the start of the newsflash at the theatre, the opening title has "Selzer" as the cameraman and the narrator is "Moray." "Selzer" is a reference to the Warner Brothers producer Eddie Selzer, whereas "Moray" is a reference to Norman Moray, the key executive with the Vitaphone Corporation, Warner Brothers' short subject division.