As it is visible, 1966 Lincoln Continental has filler cap on the left side. Kjeld and Benny purportedly pumped out fuel from the car while being on its right side.
About 10 minutes and 45 seconds into the movie, we see the character Egon carry luggage down a hallway. It is clear that there is a large mirror or painting at the end of the hallway, in order to create the illusion that the hallway is longer.