There were two different versions of the closing credits for the show. The first version, used in seasons one and two, simply showed footage of the main cast superimposed over a still photograph, with the crew credits rolling over a black background. The more familiar closing credits, introduced in season three, were an homage to the end credits of The Way Ahead (1944), which had covered the training of a platoon during the war. In both instances, each character is shown as they walk across a smoke-filled battlefield. John Laurie also appeared in that movie, and his performance in the end credits of the movie appears to be copied in the sitcom. Coincidentally, the movie's lead character (played by David Niven) is named Lieutenant Jim Perry.
Sorry about the candles. The blinds are a bit thin for the gleam of the gas light.
Godfrey: Oh, I like candles. They're more romantic.
On multiple occasions throughout the series Bill Pertwee (Chief Warden Hodges) can clearly be seen mouthing dialogue of the other actors.