The Belgian's car in a 1958 Pontiac Bonneville convertible.
Mount Road, Pickering Road, Vale Road and most of Douglas Road in Parkwood Springs where Jane and Don live (used as locations in this film), have been demolished and the area returned to hilly grassland, so the area has changed out of all recognition.
Judy Geeson's debut.
The light aircraft used by Jane Don and Ted to travel to and from Belgium is one of the Auster Aircraft J family of aircraft.
The jet airliner used by McCarthy to escape from Belgium is a de Havilland Comet.