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The bridge console shows high definition flat-screen plasma displays. In the early 1980s, the equipment used would be CRT displays.
When the sub is resting on the ridge at 700 meters (2300 feet) depth, the missiles can not be launched. The maximum launch depth for the Delta III/IV submarines are 55 meters (180 feet).
Trivia: The HADS (Hostile Action Defense System) is mentioned for the first time in the series since the 1968 serial "The Krotons."
Trivia: When Clara meets the girl from the bookcover, Summers Falls, the writer is Amelia Williams.
After Solomon teleports away with Nefertiti, a voice over plays saying "Hostile targeting in progress". A computer monitor is then shown which misspells it as "Hostile targeting in process."
Trivia: When Oswin tells the Doctor about the Intensive Care unit, she mentions that they are survivors of failed Dalek campaigns on the planets Spiridon, Kembel, Aridius, Vulcan, and Exxilon. This refers to events from the classic series' stories "Planet of the Daleks," "The Dalek Master Plan," "The Chase," "The Power of the Daleks," and "Death to the Daleks," respectively.
Just before the Doctor enters the TARDIS near the end of this episode, three children see him. When River is examining the files in the future, she has photographs of the children shown at the moment they met the Doctor but there were no cameras around to take those precise photos.
Trivia: This makes the first televised appearance of a Cybermat in thirty-six years. They were last seen on-screen in the 1975 serial "Revenge of the Cyberman." The Cybermat's appearance here is closer to its very first appearance in "The Tomb of the Cyberman," rather than the sleeker (and primarily CGI) design of "Revenge."
During the teaser, the policewoman opens door 214, walks forward down the hall and opens door 215, and then continues forward down the hall and opens 214 again.
Trivia: Among the photographs on the hotel's walls are a Sontaran, a Silurian, a Tritovore, a Hoix, a Catkind, and a Judoon.
Trivia: The Doctor mentions that the minotaur-like creature is similar to the Nimon, a race of aliens that featured in the Fourth Doctor serial "The Horns of Nimon."
Future Amy says she learned the trick of making the hand-bots touch each other to stun them on her first day in the facility, when in fact she had already been there a week before she learned to do it (in the first room).
In this episode Mels comments "You said guns didn't work in this place! You said we're in a state of temporal grace!". This is a reference to a plot device from the original series in which weapons could not be discharged within the TARDIS. This was first mentioned in "The Hand of Fear (3)." In later episodes this plot device was abandoned such as "Earthshock."
Hitler shoots Mels, but at no point do we see blood (which Rory refers to) or even a hole in her dress. This happens again when Mels is repeatedly shot not long after.
Rose Tyler, Martha Jones, and Donna Noble all make an appearance as holographic images as the Doctor was selecting a voice interface.
If the TARDIS translates all known language, it should be able to translate what baby Melody is saying. The Doctor makes it clear that it is a language. Since Amy, Rory, and River have all traveled in the TARDIS, they should know what baby Melody is saying.
Vastra says that "Demon's Run is ours without a drop of blood spilled." However, at least one Monk and two soldiers are killed after the Doctor deliberately provokes them into attacking each other.
The end titles list Russel T Davies as creating the Ood and the Judoon, but no Ood appeared in the episode. This is because a scene with Ood Sigma was originally slated, but it was cut from the final episode.
In the final scene where the Doctor is about to use his sonic screwdriver on the duplicate Amy, the sonic screwdriver is shown in its extended mode when the camera is focused on the Doctor. However, when the camera is focused on Amy, showing the Doctor only from behind, the sonic screwdriver can plainly be seen as being in its closed compact mode.
During his initial instability, the Doctor-Ganger reverts to several previous incarnations:
- "One day we will get back, yes, one day" refers to the First Doctor, talking to his granddaughter Susan about returning home.
- "Reverse the polarity of the neutron flow" is typically attributed to the Third Doctor.
- "Would you like a jelly baby?" is a common offer from the Fourth Doctor (with Tom Baker's voice apparently dubbed in)
- "Hello, I'm the Doctor. No, let it go, we've moved on." is in the 10th Doctor's voice, David Tennant.
- The Cybermats appeared primarily against the Second Doctor, first appearing in The Tomb of the Cybermen
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Classics, Dark Comedy, British TV, Time Travel, Creatures