The license plate number of the 1964 silver birch Aston Martin DB5 driven by Roger Moore in the film was 6633PP. The car was made famous by the Sean Connery James Bond movies Goldfinger (1964) and then Thunderball (1965) with later models appearing in subsequent Bond pictures. However, Roger Moore who played James Bond seven times never drove an Aston Martin in a Bond film and this is his only on-screen appearance with the most famous of all James Bond cars.
When the Rolls arrives at the hotel, Sheik strides to the rear of the car and a boom mic is visible in the windshield following the actor, the shadow of the mic then appears on the ground at the right-front tire.
During the "Big Roadblock" scene when the van explodes after hitting the patrol car, you can see the wire connecting the detonator to the explosives in the van. It flies across the far bridge piling.
Yes, the script writer, Brock Yates, was inspired to write the screenplay by a real race that took place four times in the 1970s called Cannonball Baker Sea-To-Shining-Sea Memorial Trophy Dash.Yates himself has a bit part in the movie as the "Organizer", the man who speaks to the racers right before they leave.