- Executive Meddling: A positive example. The story was originally going to end with the Doctor saddened by the loss of knowledge the Silurians possessed. Barry Letts' first act as producer was to change it to him being disgusted at their murder.
- First Appearance: Of the Silurians.
- Name's the Same: There's a character named Dr. Quinn. No, not that one.
- Science Marches On: Very much a mixed bag, as the reason the Silurians went into hibernation the Moon crashing into Earth, them panicking and it taking up orbit around the Earth instead has since become a discredited theory, since when we checked Moon rocks with Earth rocks, it proved that they all came from the same place, proving that the Moon was created by the Earth being struck by a large impactor, ejecting the rock that became the Moon. Discussion of plate tectonics, however, works with what's accepted in the scientific community.
- Working Title: The Monsters.
Trivia / Doctor Who S7 E2 "Doctor Who and the Silurians"