David Calder and Anton Lesser appeared together in the same episode of Midsomer Murders three years before (s6:e5 Birds of Prey).
There is a character called DI Falco in this episode. Anton Lesser played Falco in the BBC dramatisation of the Falco books by Lindsey Davis.
This episode is based on a real life story about a female teacher who had sex with her 14 year old student
The album that DC Presley puts in the window to let Frost know not to come into the house they are sharing is "Mr. Acker Bilk's Greatest Hits." Bilk was a clarinet player known for his hit record "Strangers on the Shore."