The 1968 Mustang that Tom supposedly crashes was already desirable and valuable when this film was made, so the producers decided to save a lot of money and used a 1963 Ford Falcon as the stand-in for the wreck.
The car the father drives is a 1976 Chevrolet Monte Carlo.
Tom drives a 1968 Ford Mustang coupe. Depending on the engine, this car in excellent condition in 2022 could be worth $50,000 to $85,000 or more.