When they just escaped the police station, Shaw asks if they lost the guys chasing them. Root responds with "It was always 50/50" then their car proceeds to get hit. When the other car slams into theirs, you can see a head with long bright blonde hair being jolted from side to side. Not one of the 3 women in the car has anywhere close to that color hair. It's clearly a stunt double in place of one of the actresses.