- Ass Pull: The Borad suddenly turning up alive at the end, apparently because the one who dissolved earlier was actually a clone.
- Ham and Cheese: Paul Darrow gives a performance that has to be seen to be disbelieved. He later said that this was revenge for Colin Baker's Large Ham tendencies when he appeared as Bayban the Butcher on the Blake's 7 episode "City at the Edge of the World".
- Special Effect Failure:
- The Doctor abseils into the titular time-tunnel, which is filled with glittery crystals... which are obviously made of plastic that is visibly abraded by the friction of the rope.
- The glove puppet Bandrel Ambassador is also memorable for all the wrong reasons.
- What an Idiot!: The Borad announces that he intends to dupe the neighbouring Bandrils into launching an attack on the planet Karfel, which will kill all the human populace of the planet, allowing the Borad to repopulate the planet with mutants like himself. Tekker, who is holding the Doctor at gunpoint, isn't too pleased with this plan, not least because he just fulfilled his desire to take over the planetary government.
You'd Expect: Tekker to shoot the Borad dead while the latter is busy spilling the details of his plan to the Doctor. Then he can dispose of the Doctor, persuade the Bandrils to call off their attack, and set himself up as the planet's new supreme ruler.
Instead: He steps in front of the Borad and gives a speech about how he will not let his people be destroyed. The Borad, by the way, is sat in a chair equipped with a time-acceleration ray that can age people into dust in mere seconds. Not at all surprisingly, Tekker is soon just a pile of bones on the floor, and it's only through the Doctor having enacted his own plan that the Borad is defeated.
YMMV / Doctor Who S22 E5 "Timelash"