In the scene where Gord gets his new car, when he's talking to his mom at the start of the scene if you look ahead of the yellow pickup the blue car is not there. The camera cuts away for a second and then comes back to the exact same angle and the the car is there! An extra even walks though the space the car should be in!
It's best visible at 03 min. 46 sec. into the movie
Well, even though it probably is a slipup, the car COULD have just pulled in....I mean, if there was an empty space that just happened to be a parking spot, I'm sure a car would pull into it in real life....It depends on how long the camera moved away from the area. If it was away for a long time, they could have just had another car that pulled into the spot, if it was only away for a second or two, it is most likely a slipup.