The sports car John Deray (Michael Caine) drove was a 1971 Alfa-Romeo Montreal.
The yellow sports car that Lucienne (Maureen Kerwin) drove was a 1972 Porsche 911 S Targa.
Michael Caine admitted at the time that the script wasn't the best he had ever read, but agreed to make this movie regardless.
Michael Caine and Anthony Quinn previously worked in the film "The Magus" (1968).
This movie was released as "The Destructors" and is listed as such in "The Films of Anthony Quinn" written by Alvin Marill.