Perry Mason (1957)
0 other mistakes in season 4
Starring: Raymond Burr, Barbara Hale, Ray Collins, William Hopper
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The Case of the Wayward Wife - S3-E13
Revealing mistake: Perry and Della step into an elevator but there is no line in the floor between the floor they are on and the elevator floor. It's continuous.
Hamilton Burger: Incompetent, irrelevant, and immaterial.