In the movie J. T. Walsh's Chief Inspector's name is spelled and pronounced "Mahoney", but in the original Westlake novel it is spelled "Malogna" but pronounced "Maloney".
The original novel "Why Me", by Donald Westlake is set in New York City, not Los Angeles.
David Jackson was originally set to direct, before Gene Quintano stepped in.
Following their successful heist early in the film, Bruno Christopher Lloyd comments to Gus that they are a "Regular Butch and Sundance". Lloyd previously appeared in Les Joyeux Débuts de Butch Cassidy et le Kid (1979)
Filmed in late 1988-early 1989, the opening establishing shot of the Los Angeles skyline includes the US Bank Tower whose top floors are still incomplete. The building would be completed later in 1989.