Prior to breaking into proper TV and film, in 1970, Milligan appeared, at age 33, in a United Airlines short tourism film about the City of Chicago, along with Shelley Long, during her modeling days at age 20-21, years before starring in Cheers.
Milligan left Land of the Lost after the second season due to a dispute with the producers of the show.
This scene, which was also used in the opening credits of the third season, showed Rick Marshall being transported out of the Land of the Lost.
Jon Kubichan, who both wrote and produced the episode, played the role instead, wearing a wig resembling Milligan's hair and standing with his back to the camera.
He then relocated to the Dallas-Fort Worth Metroplex area in the 1990s, where he taught acting at Adam Roarke's Film Actors Lab (where Lou Diamond Phillips studied).