The packing labels on the boxes of Abyss computers display the code "WYS NWYG", a spin on the well-known WYSIWYG computer acronym. In this case it means "What You See, Not What You Get", a clue to the nefarious nature of the systems in question.
Reet's "gravity readings" joke was inspired by a scene in the first episode of the 1975 Doctor Who story, The Ark in Space.
Stuart St. Paul doubled for actor Stephen Tredre to perform Luke's fall into the excavation.
In the brief pre-credits sequence, Mr Eldritch says the line "Nothing in the world can stop me now" which is a direct reference to The Underwater Menace: Episode 3 (1967) in which the villain, Professor Zaroff uses this now iconic line.