When Peter and Justin are pruning the hedge, Peter is wearing a pair of brown gloves. When taps Justin on the shoulder, he taps him with a bare hand.
When Riley and Drake discover Mischa's body, Drake enters the house without his mask, but then walks through the doorway with it on.
After the pregnant wife is shot in the head at the start of the movie, as the husband escapes downstairs you can see the wife laid there breathing.