The episode title is "Moon Stone" as pronounced by Robin.
While watching Friends (1994) on the TV, Thomas, Mathew Baynton, says part of Rachel's appeal is her hair. Jennifer Aniston's hairstyle became so popular that stylists created "the Rachel".
When Barclay is first introduced, it sounds like Julian says he is "rich as Crassus". Simon Farnaby, who plays Julian, played Crassus in several segments of the Horrible Histories, another series also co-written by Farnaby. What Julian actually says is "Rich as Croesus" not Crassus. Croesus was the king of Lydia in the 6th century and was known for his wealth until his defeat by Persian King Cyrus the Great.