This film was improvised from a 56-page outline. Each scene was shot in sequence, and built upon the previous scene. To aid in this experiment, the film's producers had a video-camera tube attached to the Panavision camera and connected to an Ampex studio videotape machine, allowing the actors and crew to review what they had just filmed.
During the scene in which Peter Sellers wrecks the upstairs bathroom, the band downstairs can be heard playing "It Had Better Be Tonight," which was originally written and used both as a vocal and as an instrumental score in the first "Pink Panther" film.
The interior of the mansion was a massive indoor set built at "The Lot" Studio, located at 1041 N. Formosa Avenue in West Hollywood, California. Not at the MGM studios in Culver City.