"The most important role, ironically, was invented whole cloth by Landis and Lynn: Wadsworth, the butler. While he was writing the script, Lynn had imagined Leonard Rossiter (Oliver!, Barry Lyndon) in the role - they had been working together on the dark comedy Loot in the West End of London at the time. 'One of the funniest men I’ve ever worked with,' says Lynn. 'Unfortunately, he dropped dead in the middle of act one of Loot. Awful.'" --
http://www.buzzfeed.com/adambvary/something-terrible-has-happened-here-the-crazy-story-of-how