10 Doctor Who Mistakes You Won’t Believe You Missed

10. Teleporting Paul (Knock Knock)

Series 10's Knock Knock serves as a valuable lesson in vetting your potential landlord.

The episode takes place in Bill's new home as the Twelfth Doctor drops in to help her move, only for things to get creepy when her new roomies randomly start disappearing.

Maybe the odd nature of the house can explain this blatantly obvious continuity error right at the start of the episode... or maybe not.

After Bill bins the Doctor off after he helps her move her stuff, she gets some more assistance from another Scot - her new housemate Paul.

Boxes in hand, Bill and Paul start walking up a staircase to her room. Bill starts off in front of him (see the image above), but when we see them in the very next shot, they've suddenly swapped places.

How did Paul get ahead of Bill on that very narrow staircase? Did he jump over her, Danny Pink style? Did he fall through a wormhole and transport ahead of her?

This being Doctor Who, yeah it was probably a wormhole.