The episode takes place in 1967.
David Yelland, who plays the Rumpoles' teenage son, was actually 31 at the time.
This episode is set several years in the past in 1967, to which end Leo McKern's hair and moustache, and Peggy Thorpe-Bates' hair, were darkened.
During the filming of this episode, Leo McKern (Horace Rumpole) was 57. In the book by John Mortimer, he was 67. "I, Horace Rumple, barrister at law, 68 next birthday..."