When Wendell and David are carrying the blond girl; she has a denim miniskirt, then denim pants and different shoes, then back to the denim miniskirt and original shoes. When "she" has long pants, this is obviously the camera operator they are carrying to get the point of view of the person being carried.
After Francis and Wendell have their fight in Wendell's truck, Wendell orders him out of the truck and speeds away. As Wendell's truck spins out and kicks up dirt, you can see fresh dirt from a previous take.
At 54:00 Kitty drops a glass of water onto the kitchen floor, but in the next shot the water has totally gone.
When Wendell and David are carrying the blond girl, someone wearing a brown hooded jacket or shirt moves behind them. This person is ducked down but not far enough to stay clear of the shot.