The character of Maria Gambrelli first appears in this film and was played by Elke Sommer. The character resurfaced in Son of the Pink Panther (1993), played this time by Claudia Cardinale, who played Princess Dala in the original The Pink Panther (1963).
According to the liner notes of the film's first DVD release (before The Pink Panther (1963) box set), the audience enjoyed the Inspector Closeau cartoon that played over the credits so much that the entire preview audience applauded and gave the cartoon a standing ovation, to which the theater had to stop the movie until everyone settled again.
The Japanese name Kato is pronounced throughout as Kayto rather than the correct Kahto. This error is copied from the Green Hornet radio and film-serial series which is being spoofed.
When Clouseau walks up to the bench where Dudu is "sitting" while at the nudist colony, it is obvious that Peter Sellers is wearing dark-colored swim trunks while holding the guitar.
Clouseau: Facts, Hercule, facts! Nothing matters but the facts. Without them the science of criminal investigation is nothing more than a guessing game.