I'll go ahead and believe that the car is still in the same spot after George watches an entire movie, but if you'll notice that when he comes back to the car it is almost dusk. Yet in the following scene when Jerry has to do the "sorry wave", it's bright as the midday sun! This is probably the most-outdoors Seinfeld episode ever, so they were a bit inexperienced setting up the shots.
It was mentioned by Jerry, I believe, that before the show's end there was going to be an episode filmed in NYC. This wasn't it, was it? Could there be some actual New York scenes in the finale?