Elvis Presley was inducted into the U.S. Army on Monday, March 24, 1958, which likely places the events of this episode during the previous week.
The show's title is the song Jailhouse Rock (1957) written by Jerry Leiber and Mike Stoller that was a hit for Elvis Presley in 1957 from the movie of the same name.
Howard (Tom Bosley) goes to a convention in Cleveland, Ohio. The distance between Milwaukee and Cleveland is about 425 miles.