This was the third film made under a five picture contract Don Knotts signed with Universal Studios in 1965. The first (and most successful) of them was 1966's The Ghost and Mr. Chicken.
Universal Pictures got the remake rights to this material, which had originally belonged to Paramount, when their parent company MCA purchased all rights to the entire Paramount Pictures film library for several million dollars in 1949.
Last film of Frank McGrath. He died more than a year before the release of this film. His last three films were released posthumously, two of which were Don Knotts comedies.
Last screen appearance of Frank McGrath (1903-1967)