In the episode where in the very begining Sully and Davis are performing a road block where they are searching unmarked work vans and trucks, they ask to search this one white truck and as they begin to search the truck takes off, of coarse Sully and Davis go in hot pursuit. Sully and Davis are the only car in pursuit and back up can't find them. When above angles of the pursuit are shown, on multiple shots it shows Sully and Davis pursuing in two different police cars. the first shot is of a Ford Crown Victoria and the second is a Chevrolet Impala(which look totally different from each other). This happens about 3 or 4 time until the pursuit comes to an end with the white truck crashing into fence, and Sully and Davis in the Crown Vic.