In an early scene where Mel Gibson is talking to his son, a boom mike can be seen at the top of the screen.
Boom mikes drop in several times throughout the film.
Toward the end of the movie there are TV scenes of people on the street being interviewed. In the background all the cars are covered with heavy snow. In the middle of the movie when Mel Gibson is in the interview room in the jail with the guy who he paid off to stop the machinist strike, the guy jumps at Mel and punches him. Mel gets up and he has a bloody mouth. A few seconds later after the guy is led out of the room Mel no longer has blood on his mouth.