- Contest Winner Cameo: Nine-year-old John Bell from Kilmacolm, Renfrewshire, Scotland, entered a Blue Peter competition to appear in this episode. He was notified by phone by Russell T Davies that he had beat out 8,000 other competition applicants to appear on the programme.
- No Stunt Double: John Barrowman actually performed the stunt of Jack leaping onto the TARDIS. On his birthday.
- Reality Subtext: Upon first meeting, the Doctor (of all people) asks Jack if he's "had work done". John Barrowman, by his own admission, had some minor botox done around his eyes, probably during the year and a half between his appearances on this series.
- What Could Have Been:
- Originally, as the prelude to this episode in Torchwood's season finale implied, the TARDIS was meant to land inside the Hub instead of above it in Cardiff Bay. This was changed for a better visual for Jack's irregular hop onto the TARDIS, but left the Continuity Snarl in End of Days' setup for the scene unaddressed.
- The Futurekind originally travelled around on quad bikes. This was abandoned due to safety issues.
- The Doctor's response to the regenerated Master asking him to "use my name" was originally intended to be The Reveal of who Yana really was, but the writing team decided it would be a pity to have Jacobi not be able to utter his catchphrase during his brief stint as the character.
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