Alfred Hitchcock Presents

"Pax vobiscum," which Hitchcock signs off with at the end of the episode, is latin for "peace be with you."

When Hildegard "wins" in chess, she takes out one piece and moves hers to an entirely different space on the board - a move that's non-existent in chess.

The theme of a serial killer in this episode who whistles the same tune ("Greensleeves") preceding each murder is reminiscent of the killer in Fritz Lang's M, who whistles "In the Hall of the Mountain King" before he strikes.

When Hitchcock is wrestling with the man trying to tie his bowtie in the last scene, one can see Hitchcock smothering a smile.

The name of the woman in Ernest's fantasty - Lalage - is derived from the Greek word lalageo which means "to babble" or "to chatter."

There is a continuity problem in this episode with the time of day of when everything occurs. For example, in the beginning of the episode, it seems that the murder and subsequent driving through the woods happens at night, as all is dark and the vehicle's headlights are on. However, as time goes on, the scenery and sky appears lighter, as like dusk. After the car's bulb is changed, a clip is shown of the car driving through a wooded area and the shadows are very long, as they are in the late afternoon or early evening, which would indicate it was earlier in the day.

Goof: A shadow passes over the back of Charles in the scene in which he and Beryl are embracing.

When Aunt Muriel dumps the puzzle out on the table, it is in a small heap. In the next shot, all the pieces have been spread out and part of the outside of the puzzle is put together.

The "corpse" lifts his head slightly as he is dragged over an uneven place in the hard floor of the carriage house.