Technically not during the duration of the movie, but the very end scene shows the two main characters potentially going into a shootout to their deaths.
Towards the end there is a scene in a diner where Brad Pitt tells the kid to chew with his mouth closed but he continues to smack his lips while eating. It was slightly triggering for me.
Starting about 3/4 of the way through there is excessive gun violence all the way to the end. (Look for the wedding scene and then it will be after that.)