In the Greek restaurant, as Grace leaves for the restrooms outside, an extra (girl reading a paper) passes the boxers as they stay seated. In the next shot the same girl, reading the paper, comes on walking from where she must have been before we saw her following in the direction Grace left.
Vince's eye is seen wide open despite being cut and swollen earlier in the fight
Blood on Vince's face during the final fight scene.
During the drive when Vince is telling the story of how he was robbed they show him in a fight where the tattoo on his back says Grace. Later, when he and Cesar are fighting the tattoo on his back says Peace.
Hank smacks Grace in the face with his right hand, but the cut appears on the right side of her lip. He uses the back of his hand.
When driving to Las Vegas, Grace is constantly driving the car over the double yellow line and across it as if she is being towed by the camera truck.