An interesting feature of the Ghosts (UK) episode (Season 1, Episode 5) is its deep-cut connection to the sitcom Friends .
In a tribute to the Friends opening credits, the episode concludes with Mike and Alison moving a sofa outside so Robin can watch the lunar eclipse. The ghosts sit on the sofa in a formation that mirrors the Friends cast in front of the fountain. [S1E5] Moonah Ston
It is revealed that the grounds of Button House were once a sacred site that Stonehenge was actually copied from. An interesting feature of the Ghosts (UK) episode
When Julian describes the neighbor Barclay as being "richer than Crassus," it’s a meta-joke: Simon Farnaby (who plays the ghost Julian) famously played Crassus in the Horrible Histories series. It is revealed that the grounds of Button
The title is the caveman ghost Robin's pronunciation of "Moon Stone".