"Shaving Ryan's Privates" is actually the name of a UK documentary on pornos that came out a few months after this episode aired, which may or may not be intentionally named.
Sally Struthers plays the mother of Mark Addy in this series. In The Flintstones in Viva Rock Vegas (2000) he played Fred Flintstone, and in The Pebbles and Bamm-Bamm Show (1971) she provided the voice of Pebbles Flinstone, Fred's daughter. Thus, Mark previously played a character that was the father of a character previously played by Sally.