According to Don Knotts's autobiography, the off-screen voice yelling, "Attaboy, Luther!" belongs to screenwriter Everett Greenbaum.
This film inspired a short-lived craze for yelling out "Attaboy, (name)" during speeches and other situations. This came from a running gag used in this film. The Farrelly Brothers used the same gag in Kingpin (1996).
The film earned $1,245,684 during its first week of release, making it the #1 top grossing movie of the week.
The "Simmons Mansion" was next door to the Munster Mansion on the Universal back lot. It appears, without the fence, in the opening credits of Munster, Go Home! (1966). However, the Munsters house doesn't appear in this film.
An uncredited script consultant was brought in to authenticate the Haunted House conspiracy based on an episode of "The Andy Griffith Show." That consultant was in fact Andy Griffith.