Trivia: The first choice for actors to play Colombo was Bing Crosby.
Columbo: Prescription Murder (1968)
1 trivia entry
Directed by: Richard Irving
Starring: Peter Falk, Gene Barry, William Windom, Katherine Justice
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.
Lt. Columbo: There must be something wrong with me. I seem to bother people, to make them nervous.