When they're driving in King's car, the time on the clock visible on the dash when King looks back at Starr varies each time it's seen, with minutes passing when one sentence is spoken, and then the last sentence happens 10 minutes before the last but one sentence.
When the girls are riding with King in his car, the speedometer and RPM tachometer are clearly visible in backseat view shots of King driving. The RPM tachometer fluctuates up and down like normal driving, but the speedometer never goes higher than zero to three MPH, clearly a sign that the actor is accelerating the gas pedal (while in neutral), but the car is being pulled or pushed for the interior shots.