Anecdotes

Because Sir Roger Moore deemed that no good photos exist of him as a child, the black-and-white boyhood picture of Brett Sinclair in the opening credits is that of his son Geoffrey Moore.

Sir Roger Moore quit smoking cigarettes in 1971, following a stern lecture from Tony Curtis on the set, which is a bit odd, as Curtis continued to smoke into the early 1980s. Update: Not that odd: Curtis was anti-tobacco but pro pot. Moore switched to cigars from cigarettes.

The cancellation of this series allowed Sir Roger Moore to accept the role of James Bond.

In one episode, Tony Curtis answers a hotel telephone with the words, "Bernard Schwartz? Never heard of him." "Bernard Schwartz" is Tony Curtis' real name.

Sinclair's car is a yellow 1969 Aston-Martin DBS (genuine reg. PPP 6H but usually seen with the plates BS 1 which was specially negotiated with UK circus proprietor Billy Smart, who owned it in reality); Wilde drives a red 1969 Dino 246 GT Ferrari (reg. MO22 1400). No, they are 1970 models as proven by the auction notes referenced elsewhere here.