Continuity mistake: When Bill unwraps the mirror Alit got her and holds it up to look at her reflection, she raises it so the top of the mirror is above her shoulders, then it cuts to a close-up where the mirror is suddenly lower. (00:16:35)
Doctor Who (2005)
1 mistake in The Doctor Falls
The Doctor: I'm not... I'm not... I'm not from Mars!
More trivia for Doctor Who
Question: 1. Why was Rose not allowed to touch her past self without creating a paradox and causing those creatures to appear and eat everyone, but Amy was allowed to touch her younger self without any repercussions? 2. Why was Rose able to have the time vortex in her head for a few minutes and it only knocked her unconscious whereas the Doctor had it inside him for about 30 seconds and it basically killed him and caused his regeneration?
Chosen answer: 1) When Stephen Moffat took over he ignored a lot of what had been developed before (there is not in-universe answer). 2) It would have killed Rose, so the Doctor absorbed the energy. His body regenerated before the energy could do a significant amount of damage that would prevent regeneration.