I just watched a broadcast of Landis' 2010 'Burke and Hare' and to my great surprise Ray Harryhausen is a bit player.
So he has an acting credit in a hilarious and bizarre movie. It's presently still on the BBC iPlayer for those who can access it.
Watched 'Burke and Hare' today and spotted Bond producer, Michael G. Wilson, in the same scene. He is credited as Michael Wilson. (I think IMDB have listed the wrong Michael Wilson).