A particular piece of music written by regular composer, Murray Gold with vocals from Melanie Pappenheim, caused an influx of emails to the BBC requesting a Doctor Who soundtrack on the back of this piece of music alone. The following year, fans' wishes were granted and a soundtrack was released on the strength of the emails inquiring about that one particular piece of music, the title of which is simply known as "Doomsday".
This episode aired the same week as the 2006 World Cup. Radio Times did variant covers of a team of Cybermen and a team of Daleks on a football pitch, the lead holding a football.
After explaining that he intends to send the Daleks and Cybermen to hell, Rose asks the Doctor if she can help. The Doctor tells her to set the coordinates "all to six." Assuming the standard X, Y and Z axes, this would make the coordinates 6, 6, 6.
One expensive sequence removed from the script at the development stage involved the Doctor and Rose ascending to the top of Torchwood Tower in the Jathaa Sun Glider (described as a "space canoe") mentioned in Army of Ghosts (2006); this was replaced with the much simpler moment of Jake summoning them into the lift.
Some elements of the story were inspired by Philip Pullman's His Dark Materials trilogy. Pullman was "flattered" by the references in the episode, and compared Russell T. Davies' actions to his own practice of referencing works.