When Raven gets on the exercise machine she puts her feet on the peddles and then we see a close up of her head. In the next full shot of her she puts her feet up again.
At the end when William and Cory are counting the money they made, there's some money in William's collar. Then in the next shot, its gone. The money keeps disappearing and reappearing until the credits come on.
In the last scene with Cory and William, there is a plug in the outlet behind them. When Tanya and Victor come in and the camera shifts back to them, the plug is gone.