Near the beginning, Jon and Punch are riding their bikes. Jon is clearly spotting a moustache and his hair under his helmet is on the long side. Just as he saves the kid from the truck on the freeway a few scenes later, his moustache is gone. A few scenes later back at the station, his hair is also considerably shorter. Later on, both the moustache and longer hair magically reappears.
The cars parked on the freeway by the truck before the car goes through the trailer are all inoperable junkers.
One car in the crash goes over another car and flips upside down. There is no-one at the wheel of that car when it's upside down.