Rance Howard, appearing in an uncredited role as the camp counselor, is Ron Howard's real-life father. As with Clint Howard, this was one of several times Rance would be part of a production involving his son,, Ron.
Stella Stevens said in a 2004 interview that her favorite director is Vincente Minnelli, who directed her in this film. She said she felt he was "the most fabulous genius with whom I've ever worked." She added that the Motion Picture Academy of Arts and Sciences recently had an evening of Minnelli's work. She attended it and they had shown excerpts from almost all his films, but nothing from this one. She she thought it was wrong to exclude this film.
Appearing in his film debut in the uncredited role of "Child at Party", in an Indian headdress, is Ron Howard's younger brother, Clint Howard. This marks the beginning of a career for Clint punctuated by appearing in film and television work that also involves his brother, Ron.
In Norman Jones' radio studio, he portrayed by Jerry Van Dyke, there are black-and-white publicity photos of various celebrities on the wall. One of the pictures is of Van Dyke's real life brother, Dick Van Dyke, who was starring in The Dick Van Dyke Show (1961) at the time the film was made. Among the many other '60s celebrities pictured are Anna Maria Alberghetti and Mort Sahl.
When Tom Corbin (Glenn Ford) returns to work, he is greeted by his secretary, Lee Meriwether, who portrayed The Catwoman in Batman: The Movie (1966). As Tom walks toward his office, hanging on the wall is a picture of Eartha Kitt, who portrayed The Catwoman on Batman (1966) from 1967-1968.