- Deleted Scene: The commercially available cut is restored from a poor quality 16mm telerecording found in Nigeria. The Nigerian censors removed a scene in the episode "Checkmate" in which two Vikings get stabbed to death for being too violent, and no visuals of the scene are known to exist. The soundtrack of the 'missing 12 seconds' does exist, and the DVD special features contain the audio, accompanied by portions of the script. The American syndication version cuts the scene in the first episode where Vicki finds Steven stowed away in the TARDIS, as it's a direct continuation of the previous story which doesn't make much sense if you haven't seen that too.
- Milestone Celebration: The story's historical setting had a particular relevance in 1965 as the 900th anniversary of the Battle of Hastings was only a year away. Production constraints meant that the series could not satisfactorily feature the battle, but nor could it be fully ignored, hence the period was taken for the setting.
- Recycled Set: The interior of the Monk's TARDIS is actually the set of the Doctor's.
- Throw It In!: According to Donald Tosh, the Doctor addressing the camera and mentioning William the Conqueror's future arrival was ad-libbed by William Hartnell.Of course none of this had been in the script. And we were all supposed to be ever so grateful! He had remembered vaguely what Dennis's dialogue was all about and thought that we'd be disappointed if he didn't manage to get the plot across. For some technical reason we weren't able to shoot it again so it had to stay in.
- Not only does this episode contain the rare Billy Fluff that works surprisingly well ("And remember, no more monkery!" for "no more monkey business"), it also contains the only recorded instance of Hartnell flagging someone else's fluff:Steven: Oh, I see. Oh, and, and if it landed on the pebbles—Doctor: On the what?Steven: If it landed on the beach against the cliffs...
- Not only does this episode contain the rare Billy Fluff that works surprisingly well ("And remember, no more monkery!" for "no more monkey business"), it also contains the only recorded instance of Hartnell flagging someone else's fluff:
- Unintentional Period Piece: It is evident that this story was produced in the 1960s: all the Monk's possessions are contemporary with that era, and he refers to the TARDIS as a "modern" police box. Only his gramophone is old-fashioned, and it was intended to be a tape recorder in the script.
- Working Title: The Monk and The Meddling Monk.
- You Look Familiar: Alethea Charlton also appeared as the cavewoman, Hur.
Trivia / Doctor Who S2 E9 "The Time Meddler"