When going to visit the prison Stone and Keller's car is a 1971 Ford Galaxie license 199 CYW, but other times it is a 1973 Ford Galaxie license 413 HZV.
There are no antennas on Stone and Keller's car, yet they are able to use a police radio that is supposedly installed in the car.
Police cars usually have a California Exempt license plate and not a private plate.
During the gunfight at the end, Keller ducks behind a wall that clearly moves when he leans on it.
The entire footage of the trip to San Quentin Prison has been reused from an episode in season 1 right up until the point that Stone & Keller meet the inmate that they are there to talk to.