In order to get the bloodhound to lick Leo McKern's face during the car trip, butter was smeared behind the actor's ear.
The horses in the in the opening race are named for other ITV productions, notably Rising Damp (1974), which is mentioned several times. When Uncle Tom and the handicapper are going over the next races, one of the horses is "Degree Absolute," the working title of the penultimate episode of The Prisoner (1967), famously featuring Leo McKern as No. 2.
Mr. Justice Twyburne Roland Culver shares an after dinner joke with Rumpole, who then tells it four years later in Rumpole and the Old, Old, Story (1987) setting up the chain of events he has to contend with.
Joanna David who plays the accused Jennifer Postern and Tim Wylton who plays the pathologist Dr Overton played Mr & Mrs Gardiner in the classic 1994 Pride & Prejudice adaptation with Colin Firth & Jennifer Ehle