Wissenswertes

Peter Sellers did not give a pony to his son Michael as shown in the film. He gave it to his younger daughter by Britt Ekland several years later. The change was made in order to compress events for dramatic purposes. According to the screenwriter, the horse disappeared after a couple of weeks, and when his daughter wanted to know where it was, he replied that he had given it to Princess Margaret.

The real Blake Edwards hailed Geoffrey Rush's performance as the best he'd ever seen, and said that in some shots he thought he was seeing the real Sellers.

Geoffrey Rush was only one year younger than Peter Sellers was when he died, and here, plays him over the course of thirty years.

Scenes with Peter Sellers' fourth wife, Lynne Frederick, were cut from the final print. The film doesn't directly mention Sellers' third wife or his brief engagement to Liza Minnelli, which ended when she pulled off his toupée as a joke.

In one shot of a cinema marquee, a poster for Der Bunker (1973) is visible, advertising Sellers as one of "Eight men trapped in a bunker." Below Sellers' name appear those of six of Sellers' seven co-stars. The missing name is Peter Vaughan, who plays Sellers' father in this film.