- Bizarro Episode: Even by Doctor Who standards. The Doctor rides a horse through a portal in time in a mirror linking a spaceship to a girl 3000 years in the past (who he read the mind of, incidentally) because an army of robots want to steal her brain because the ship is named after her. And there's a rotating fireplace.
- Hilarious in Hindsight / Memetic Mutation: "You're Mr. Thick Thickity Thick-Face from Thick Town, Thickainia... and so's your dad!" At the time of the episode airing, the Doctor calling the robot "thick" meant that he was calling the robot stupid (as in, "thick-headed"). The repeated use of the word "thick" to the point of Overly Long Gag was simply the Doctor being silly, as he often is. However, as of the latter half of the The New '10s in Real Life, "thicc" has become a widespread meme about expressing sexual attraction to someone with Hartman Hips. Taken in the context of "thicc" and not "thick", it would appear that the Doctor is very sexually attracted to both the robot and his dad, and being overly complimentary of their Hartman Hips.
- Uncanny Valley: The Clockwork Robots are supposed to be in disguise as humans. However, the constant loud ticking they make, their Machine Monotone voices and their stiff and inhuman movements give them away almost instantly.
- What an Idiot!: At the end, the Doctor wants Reinette to come with him. However, the time window into her time forces her to take "the slow path" to his next visit.
You'd Expect: He'd either bring her through the time window to avoid the problem, or he would use the TARDIS to get her.
Instead: He tells her she has two minutes. Two minutes later, he goes back through the time window, but it's been several years in her time, and she's dead by the time he shows up.
YMMV / Doctor Who S28 E4 "The Girl in the Fireplace"