Trail of the Pink Panther series regulars include Herbert Lom as Chief Inspector Dreyfus, Graham Stark as Hercule LaJoy (last seen in the 1964 Pink Panther film "A Shot in the Dark"), Burt Kwouk as Clouseau's faithful man servant Cato and André Maranne as Sgt. François Chevalier. "Trail" featured the animated opening and closing credits, animated by Marvel Productions and written and directed by Art Leonardi. Director Blake Edwards dedicated the film to Sellers, "the one and only Inspector Clouseau." Despite the dedication, Sellers' wife Lynne Frederick filed a $3 million lawsuit against the film's producers and the studio, claiming that the film diminished Sellers'
A Shot in the Dark (1964 film) him to take over as director of "A Shot in the Dark" from Anatole Litvak. Edwards declined initially, but eventually relented under pressure on the condition he could rewrite the script and substitute Inspector Clouseau for the lead character and choreograph comic scenes on the fly as he and Sellers had successfully done for their previous film. The relationship between Edwards and Sellers deteriorated to such a point that at the conclusion of the film they vowed never to work together again. They eventually reconciled to collaborate successfully four years later on "The Party", and on three more "Pink Panther"