- Hilarious in Hindsight: The Doctor criticizes the Monk for interfering, which is what the Time Lords put him on trial for. The Doctor seems to have affected history in a way similar to the Monk. Then there is the Time Lord Victorious.
- Moral Event Horizon: Word of God confirms that the Vikings did, in fact, rape Edith.
- "Seinfeld" Is Unfunny: This was a Wham Episode at the time because it was the first story pitting the Doctor against another alien force in a historical period — up until then, historical stories and science fiction stories had been entirely discrete, so The Reveal that the Monk is another time traveller was a huge twist that broke the established rules of the show. Of course, the 'pure historical' (a story taking place in a historical period with no sci-fi beyond that of the time travel itself) is a format all but abandoned after the William Hartnell era, so modern viewers checking out his stories often find it more surprising when the Doctor goes into the past and aliens don't show up.
- Stock Footage Failure: There was originally a very poor quality looking shot of the viking ship approaching. The restoration team used a new scan of the stock footage for the DVD, but found that (by going from a multi-generational 16mm TV recording to a 35mm newsreel extract) the restored stock footage looked too high quality. In the end, artificial grain and softness was added to make the stock footage look like the rest of the episode.
YMMV / Doctor Who S2 E9 "The Time Meddler"