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) as Burt Kwouk as his stalwart man servant Cato and André Maranne as François, all of whom would become series regulars. Elke Sommer portrays the murder suspect, Maria Gambrelli. The character of Gambrelli would return in "Son of the Pink Panther" (1993), this time played by Claudia Cardinale, who appeared as Princess Dala in "The Pink Panther" (1963). Graham Stark, who portrays police officer Hercule Lajoy, would reprise this role eighteen years later, in "Trail of the Pink Panther" (1982). The film was not originally written to include Clouseau, but was an adaptation of a stage play by Harry Kurnitz