Did You Know?
There's an in-joke in this episode - when the policeman is questioning the heroine about finding the impostor Babs Bryant at the American Embassy, he mentions about the name being quite common in York - he then makes an indirect reference to The Avengers - he says something along the lines of "a TV series comes on and suddenly, everybody gets called Emma" - a reference to Emma Peel from The Avengers. Both Thriller and The Avengers were created by Brian Clemens. See more
When Babs Bryant leaves the flat, heading for Carter's car, her suitcases are red: but when she reaches the car, one is brown and the other blue. By the time their journey ends and she is shown into the country house, they are back to being red again. See more