Before “Goldfinger», gadgets as such is not used in cars that participated in the filming of a James Bond movies. Aston Martin DB5 from “Goldfinger» was the first car stuffed with spy gadgets in films of James Bond series.
In the script the car in Goldfinger was armed only with a smoke screen, but every crew member began suggesting gadgets to install in it. There were revolving license plate because he had been getting lots of parking tickets, while his stepson suggested the ejector seat, wheel-destroying spikes and the others spy gadgets.
Then John Stears the master of special effects has installed all gadgets on Aston Martin DB5 car weight has been increased by 140 kg. Therefore in drive scenes it took another Aston Martin DB5.