This was The Three Stooges' final completed film as a group. They made one more film together, Kook's Tour (1970), but the film sat unfinished and unreleased for years due to Larry Fine suffering a stroke before the movie was complete.
The actors who portray the gunslingers were local hosts of The Three Stooges television programs in the 1960s. One of them, Don Lamond, who was the host in Los Angeles, was Larry Fine's son-in-law. The other hosts and their respective cities were: Joe Bolton (New York), Bill Camfield (Dallas-Ft. Worth), Hal Fryar (Indianapolis), Johnny Ginger (Detroit), Wayne Mack (New Orleans), Ed T. McDonnell (Boston), Bruce Sedley (San Francisco), Paul Shannon (Pittsburgh) and Sally Starr (Philadelphia).
Emil Sitka's final film appearance with The Three Stooges. A regular in their films for decades, Sitka would actually officially become a Stooge in the early 1970s after Larry Fine was forced to retire, but he never made a movie in this role.
Norman Maurer is the son-in-law of Moe Howard. Jeffrey Scott, who plays "Kid," is Maurer's son and Moe's grandson.
The title, "The Outlaws is Coming!", is a pun referring to Alfred Hitchcock's The Birds (1963), which was promoted with the tagline, "The Birds is Coming!".