Fric frac, rue des diams

The title of Charles Grodin's first autobiography, "It Would Be so Nice If You Weren't Here..." was taken from an incident that happened on the set of this movie, as he explained in his introduction: "Candy Bergen and I were filming the movie 11 Harrowhouse in a castle outside London. We were sitting in a room off of the main hall where the cameras were being set up. After a few minutes an Englishwoman appeared. I don't know who she was, but she acted as though she had a Duchess-or-something title. She said: 'Did someone ask you to wait in here?' 'No', we answered, a bit taken aback. She responded: 'Well, it would be so nice if you weren't here.'"

When Maren (Candace Bergen) and Howard (Charles Grodin) take the diamonds to Massey's (Trevor Howard) house after the theft, they zoom around the parking area outside the house while a couple of Massey's goons hang on the sides of the truck. The parking area is gravel, yet the truck tires squeal as if they were on a paved surface.

Referenced in The Tonight Show Starring Johnny Carson: Victoria Principal/Charles Grodin/Jerry Seinfeld (1982)