When Amy and Mandy arrive at the "hole", a sign can be seen above the workman's tent that says "Magpie Electricals", a company crucial to the plot of The Idiot's Lantern (2006).
Steven Moffat cited this as his least-favourite among the episodes he wrote, describing it as "a bit of a mess". In 2019, he has mellowed his opinion down as revealed on an Instagram post, with the encouragement of Russell T. Davies.
Many of logos used on board the Starship UK parody the BBC logo and idents used in the early 1960s.
Crack Sighting: On the shell of the Starship UK.
For the opening scene in which The Doctor holds Amy's ankle while she is suspended in space, Karen Gillan was hoisted on wires above the TARDIS prop in front of a green screen while a wind machine created the effects of being in space.