When Sam picks up the little girl to run behind the ghost barrier she's missing both her shoes for 2 seconds then they're miraculously back on in the next second.
When Castiel enters a house, he passes a thermostat showing the temperature in Celsius (because filming was done in Vancouver, Canada). A thermostat in the U.S. would show temperature in Fahrenheit.
The Woman in White says Dean took her home. When in fact it was actually Sam that took her home in Pilot.