The Pink Panther Film Collection consists of 5 Panther films and 1 bonus disc. Only 4 of the films are worthy ('Trail of the Pink Panther' is a train wreck of a film - it's a film made of outtakes and clips from previous films tacked together two years after Peter Seller's death), and it's also missing a major Panther film ('Return of the Pink Panther') which was the first Sellers-Edwards collaboration immediately following the hiatus after 'Shot in the Dark'.
The 4 worthy films, though, shine as comedy classics, fully display Sellers' genius, witness the evolution of the Clouseau character, and feature the talents of Seller's surroundings casts and Edwards' direction. Many can argue which is the best film; I personally prefer 'The Pink Panther' followed by 'Revenge of the Pink Panther'.
The bonus disc has one documentary about the Panther films, one documentary about the Panther animation, and 6 Pink Panther cartoons. The main documentary has some good info about the Panther series, but is not nearly as comprehensive as it could be. There is no mention of the thought process behind 'Trail' and scant detail about the other films.
'The Pink Panther' has audio commentary by Blake Edwards, a trivia feature, a photo gallery, and the original trailer. The other films have only the photo galleries and trailers.
Deep insight into the Pink Panther series is missing in this collection, but it's also an excellent value for four great comedies.