Fake American: The actor (Bruce Boa) who played the American Mr. Hamilton was actually Canadian.
Fake Brit: Yes and no. Connie Booth had lived in Britain for so long that she could be said to be actually British. Also played with in "Gourmet Night," where she sings in a perfect but annoying American accent.
Fake Nationality: Manuel, who's from Barcelona, is played by Andrew Sachs, a German-born British actor.
Grandpa Joe is on the verge of having a large garden gnome inserted in him.
Mrs. Hudson is one of the guests at Basil and Sybil's anniversary party.
Real-Life Relative: John Cleese (Basil) and Connie Booth (Polly) were married when they wrote and acted the first series (1975). By the time of the second, in 1979, they were divorced, although they were on good enough terms to keep working together.