 In the first episode where William Shatner (qv) plays The Big  Giant Head, he talks about the dreadful experience he had aboard an  airplane, whereupon John Lithgow (qv) exclaims, "So did I!" This  is an inside joke about the _"Twilight Zone, The" (1959)_ (qv)  episode Nightmare at 20,000 Feet (1963). William Shatner played the  lead role in that episode of the 1959 TV series and John Lithgow  played the lead role in that story in  _Twilight Zone: The Movie (1983)_ (qv).