- Dawson Casting: Greg Austin, Sophie Hopkins, Fady Elsayed and Vivian Oparah are 24, 26, 23 and 19, respectively, with the former three playing 17-year-olds and the latter a 14-year-old. This is likely in part due to the sexual content that would have made casting age-accurate actors inadvisable. One character is also shown smoking cigarettes which, likewise, might have been prevented had an underage actor been cast.
- Development Gag: One early conception of Susannote in Doctor Who was that she'd be an exiled alien princess. Class gives Charlie a similar background.
- Disabled Character, Disabled Actor: April's mum, wheelchair-bound following a car crash, is played by wheelchair-using actress Shannon Murray. Weirdly subverted when April uses her Shadow Kin powers to heal her Mum's spine in "Co-Owner Of A Lonely Heart", although she doesn't immediately have the strength to walk. But then Jackie loses her abilities again as a side-effect of Charlie exterminating the Shadowkin.
- Executive Meddling: According to UK media reports in the summer of 2016, the producers were required to tone down the show's sexual content and violence before the BBC would allow the Doctor to appear. (Previously, the BBC had forbidden the Doctor from appearing in the adults-only Torchwood, so there was precedent.) It's unclear as to whether this only referred to the episode in which the Doctor made his cameo appearance, or the series in general.
- Follow-Up Failure: For reasons covered elsewhere, the series failed to click with UK audiences, generating poor streaming figures and later being "burned off" by BBC One in a late-night timeslot. This despite the fact that, Christmas specials notwithstanding, it was the only televised Who franchise production for more than a full calendar year. However, by that point Who itself had seen a significant slide in mainstream popularity in the Peter Capaldi seasons partially because he didn't appeal to younger audiences the way David Tennant and Matt Smith had, and that didn't bode well for a youthful spinoff.
- Jossed: When Miss Quill was indicated to be a Coal Hill teacher and an undercover alien in early publicity, many fans immediately theorised that she would be a new incarnation of the Doctor's granddaughter and Coal Hill alumna Susan. In fact, she's a completely new character and not a Time Lord.
- Recycled Script: The appearance of Sophie Aldred as Ace in the Big Finish audios hearkens back to a plan to have her appear in The Sarah Jane Adventures before the untimely passing of Elisabeth Sladen put the kibosh on everything.
- Spoiled by the Merchandise: The tie-in novels released two days before the third episode of the TV show, spoiling Matteusz being kicked out of his house and moving in with Charlie, Ram and April dating, and April's family history.
- Screwed by the Network: After underperforming as a BBC Three stream, BBC One eventually announced it would air the show in a late-night time slot on a weekday, burning off the episodes in four weeks flat. The ratings were about what one would expect (even the episode in which the Doctor appeared) - actually lower than the average for the time slot by a factor of several hundred thousand — leading fans to assume that a Series 2 renewal was unlikely (the cancellation of the series would indeed be confirmed in September 2017). The main reason given for the late scheduling was the violence and to a lesser degree sexual content, despite BBC One having no problem airing sexually explicit and violent shows earlier in the evening. It should also be noted that prior to Class debuting on BBC Three it was actually assumed that a BBC One broadcast would occur soon after, not several months later, and the series was also impacted by the decision from BBC America not to offer the same sort of same-day broadcast it afforded Doctor Who (contrast with the Canadian network Space that aired the episodes the same day they streamed in the UK). When Patrick Ness announced his departure from the series, he specifically criticized BBC One for how it had scheduled the show.
- What Could Have Been: When Patrick Ness announced he was leaving the show, he shared some of the ideas he had for a second series: a Weeping Angel civil war (and their home planet), Quill having a dangerous son, and Charlie and Matteusz doing shirtless wood chopping. In May 2018 it was announced that the series would continue in new audio dramas produced by Big Finish Productions; none of Ness' planned plotlines have been adapted, as their license only permits stories set during the television series. (Though it must be admitted the Angels and the shirtless wood-chopping probably wouldn't have the same appeal in audio anyway!)
- You Look Familiar:
- The Chair of the Governors as seen in episode 8 is played by Cyril Nri, who played the Shopkeeper in The Sarah Jane Adventures. It is currently unknown if they are the same character.
- Dorothea is played by Pooky Quesnel, who previously played the starship captain in the 2010 Doctor Who Christmas special, ""A Christmas Carol".
Trivia / Class (2016)