When John's character is set on fire, a hooded stuntman can be clearly scene in flames (John wasn't wearing a hood at that time).
During the car chase scene every time the prison guard chasing Brenda fires his gun you can see he's driving in a very different environment than the car Brenda is in.
When John tells Brenda that Rachel can stay (both are speaking in the kitchen) a boom mic dips very deeply into the frame.