The Moonstone disc displayed in the museum is a replica of a real bronze age artifact: the "Nebra sky disc" (Himmelsscheibe von Nebra), found 1999 near Nebra, Saxony-Anhalt in Germany. The description given by Catrina is spot on: dated around 1600 BC, and probably used to harmonize the moon and the sun year (354 vs. 365 days).
Character Mags Dormer's nickname "Mystic Mags" is a reference to Mystic Meg (aka Margaret Lake) who was briefly famous in the mid 1990s when she used to appear on The National Lottery (1994), foretelling who might win money on the lottery.
Adrian's description of Gagan having "A Brain the Size of a Planet" come from Hitchhikers Guide to the Galaxy, Marvin the Paranoid Android claimed to have one
The chances of being hit by a meteorite are about 840,000,000 to one according to various studies since any meteorite is more likely to burn up in the atmosphere and very few make it to the ground. There is only one recorded case of a meteorite hitting a person and they survived.
The old lodge Taplow Berks is used as the location for Duttas pharmacy in this story and previously was used as. Filming location in the episode "Ring out your dead".