In an early scene, a character asks for Room 412. This references a famous joke from one of Stan Freberg's routines "St George and the Dragonet" which was a #1 hit record in 1953 and was a popular in-joke at one time in acting circles. The joke's punchline - the Dragnet-style cop says "I've got you on a 412 as well." What's that, shouts the criminal. "Over-acting" replies the deadpan cop.
In the opening, the hotel manager is on the telephone where he can be heard saying "Miss Otis regrets she's unable to lunch today". This is a line from the 1934 Cole Porter song Miss Otis Regrets.
Bertram's Hotel is named after Brown's hotel.
Inspector Bird: I've just been speaking to the Rembrandt expert at the National Gallery. Apparently our fake is the worst kind of copy.
Mr Humfries: What's wrong with it?
Inspector Bird: It's the original.
This episode is adapted from the novel, At Bertram's Hotel (1965).
Tilly Rice - Strangled
Mickey Gorman - Shot in the back
A 1987 adaptation was made by the BBC, starring Joan Hickson. Produced again in 2007 with Geraldine McEwan as part of the third series of Marple.