Skidoo was filmed in San Francisco, California.

Shooting began on March 18th, 1968 and wrapped no less than two months later on May 17th. It was released on December 19th, 1968.

The tagline for Skidoo was: "It takes two to Skidoo."

Doran William Cannon also wrote the screenplays for Brewster McCloud (1970) and the supernatural thriller Hex (1973) starring Keith and John Carradine.

Skidoo was Groucho Marx's last film.

John Phillip Law was brought in to play the main hippie, Stash. His brother Tom was also hired, who was at that time a real hippie.

Skidoo was referenced in the Rob Zombie movie The Devil's Rejects (2005).

LSD guru Timothy Leary appears in the Skidoo trailer.

The outside scenes of the prison were filmed at Alcatraz in San Francisco. Most of the other scenes were also filmed in real places, including the house of Gleason and his wife. The only set that appeared in the film was Frankie Avalon's bachelor pad.

God (Groucho Marx)'s yacht actually belonged to John Wayne. (Preminger had previously directed him in In Harm's Way, 1965).

In the marriage sequence towards the end of the film when God's yacht is overtaken by the hippies, George Raft is holding a book called The Death of God.

Singer Harry Nilsson wrote and sang the closing credits to the film, along with some of the other songs in the film such as "Living in a Garbage Can" and "I Will Take You There."

John Phillip Law turned down Midnight Cowboy (1969) to be in Skidoo.

Preminger played Mr. Freeze in the Batman television series and employed other Batman-regulars such as Frank Gorshin, Cesar Romero, and Burgess Meredith for the film.

A young Richard Kiel (Eegah, 1962) also appears as a prisoner in Skidoo.

The naked Green Bay Packers that were seen in one of the acid trip sequences were actually members of a local college team dressed in Packers uniforms.

Compiled by Millie de Chirico

Sources:
www.imdb.com
www.allmovie.com
The Cinema of Otto Preminger by Gerald Pratlow
Otto Preminger: The Man Who Would Be King by Foster Hirsch
The Worst Movies Of All Time or What Were They Thinking? by Michael Sauter
Psychotronic Magazine Number 12
www.rogerebert.com
www.variety.com
www.filmthreat.com
www.channel4.com
www.shockcinemamagazine.com
www.citypaper.net