34-year-old Robert Donat ages 63 years (1870-1933) over the course of this movie. He remarked: "As soon as I put the mustache on, I felt the part, even if I did look like a great Airedale come out of a puddle."
Greer Garson's performance runs a little under 25 minutes, yet she received an Oscar nomination in the Best Actress category, one of the shortest performances to have been so nominated.
The life preservers on the Danube River steamboat are marked with the initials D.D.S.G. The letters stand for Donaudampfschiffahrtsgesellschaft, or Danube Steamboat Shipping Company, a real steamship line founded in 1829. As of 2023, it is still in business, operating passenger service as DDSG Blue Danube Gmbh.
Although Mr. Chips is approximately 25 years older than his wife Katherine, Robert Donat was almost five months younger than Greer Garson.