Doctor Richard Carlisle takes Stevens to the car, helps him fill the fuel tank and after hearing his story about lord Darlington he seems intrigued and asks Stevens a question: “If a mistake was to be made, wouldn’t you rather have made your own?”
Carlisle is a fringe figure in the film, who Stevens meets on his way to the appointment with Miss Kenton but his words make Stevens aware that he made a mistake that he intends to remedy.
I love Emma Thompson 