The Family of Blood (2) - S3-E9
Corrected entry: When Headmaster Rocastle is outside in front of the school, he is talking directly to Jeremy Banes. He tells him that "people have died". However, the Headmaster addresses him as "Mr. Smith". Mr. Smith is the name the Doctor assumed when he became human.
Correction: I don't understand how this classifies as a mistake, it's merely stating facts that happened during the episode. There's no mistake here. Rocastle was talking about The Doctor, but he's known as John Smith while he's human.
Knever