The Road Runner shown is a 1970 model, not a 1968/1969.
Two different models of cars in Richard Petty #43 STP livery are shown, one a 73-76 model Charger, the other a 1968-69 Road Runner.
The red lights on Ponch and Jon's motorcycles flash alternately instead of one on steady burn and the other flashing as required by California vehicle code and in consistency with the rest of the show.