The poster art depicts a youthful Robert Donat (as he appears in the early scenes of the movie) with the young Greer Garson. However, the two never appear together like this in the movie. Mr. Chips is about fifty when he first meets Katherine, who is about half his age.
Thirty-four-year-old Robert Donat ages sixty-three 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."