At around the 45:40 mark, S&H leave the pier in what is clearly a Ford LTD/Galaxie police cruiser. In the next scene, they are heading down the road in a Chevrolet product.
The faraway shots of the truck hanging over the pier show Stargar sitting closer to the steering wheel. Close-up shots show him peering in fear out the open passenger side window.
When Captain Dobey arrives to make the arrest on the pier (around 42 minutes), the building behind him clearly states "Port of Los Angeles" at the top, even though the show is set in fictional Bay City.
As Starsky & Hutch pull up in front of the getaway car in front of the shop that is being robbed, they go to reverse their car next to the getaway car. A quick side view from the getaway car shows their car already parked up before they have even reversed in there.