When they are robbed, one of the masked men shoots out the rear tire. When the car goes through the ice, the tire that was shot out is obviously holding air.
When the puppy gets away from Alden at the hospital construction zone, the puppy runs into a ventilation duct and makes a right turn. The next shot has a crane camera showing the general area, including the ventilation duct, which runs straight and even uphill for over 100 feet with absolutely no right hand corner, instead there is a left hand corner.