to be added
- It has been almost three days since Apollo 8 launched.
- Apollo 8 was launched by Saturn V, a 110-metre launching rocket.
- The Doctor references Lovell as the "hero of Apollo 13."
- The Doctor says that he had used UNIT's storage of alien artefacts to repair his TARDIS while stranded with a broken Dematerialisation circuit.
- K9 does not appear in the story, but is shown in the accompanied illustration.
- The TARDIS is packed full of wrapped boxes. The Doctor notes that the downside to having a ship that dimensionally transcendental is that it's hard to clean. The Tenth Doctor would come to the same conclusion, after calculating that a simple cleaning session for the TARDIS would take more than six years. (COMIC: A Rose by Any Other Name)
- The Doctor notes that while UNIT has a large collection of UNIT artefacts, they understand very few of them. A Zygon in the Black Archives would note the same fact in the 21st century. (TV: The Day of the Doctor)
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