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.)
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.