I managed to get my hands on a copy of the 1935 movie based on the book. It's really close to the book with one glaring exception. The following spoiler reveals something from chapter 2:
Back to the movie: Gilbert Emery's performance as Betts the butler has convinced me Stephen Fry is a time traveler. Emery couldn't have done a better impression of Fry's Reginald Jeeves if he tried, which is remarkable considering he died 12 years before Fry was born. Not only does Emery act like Fry, in this film he even looks remarkably like Fry.