Revealing mistake: Just after the scene where the doctor asks Columbo to switch off the light before leaving, the detective does so, but it can be seen that both light switches are down before he does this, and that they are still both in the down position after he "switches off" the light.
Columbo: Prescription Murder (1968)
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Directed by: Richard Irving
Starring: Peter Falk, Gene Barry, William Windom, Katherine Justice
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More mistakes in Columbo: Prescription Murder
Dr. Ray Flemming: They expect me to be on call at all hours.
Lt. Columbo: Same with me, Doctor.
Trivia: The first choice for actors to play Colombo was Bing Crosby.