As Ace is leaving the boarding house, the television is on, and the BBC announcer says "And Saturday viewing continues with an adventure in the new science fiction series, Doc-" and is cut off, referencing the fact this serial takes place in 1963, the year the series first aired. Ben Aaronovitch "couldn't resist" the reference, and clarified that it was meant as a joke and was not to be taken seriously. Originally, it was intended that the show that was introduced would be called "Professor X".
Sylvester McCoy's favourite scene in this story is the scene in the café where The Doctor muses over the weight of the decision he has to make.
Sophie Aldred mentioned that after her marriage and her children, the greatest moment of her life was the fact that she beat up a Dalek using a baseball bat. And she would carve it on her tombstone. While filming this scene, she inadvertently damaged a real Dalek casing with her baseball bat rather than a dummy prop.
The Doctor is seen reading the book 'Doctor in the House'. This was a running gag Sylvester McCoy thought up: each time the doctor is seen reading, the book has the word 'doctor' in the title.
Andrew Cartmel was particularly proud of the scene where Ace finds a NO COLOUREDS sign. When it was screened to the BBC Head of Drama, rewound the tape because the Head of Drama had missed the sequence due to a phone call. The Head of Drama felt that Ace should have torn the sign down, and Cartmel agreed it was a missed opportunity.