When Harvey and his gang enter Emma Prescott's house, one of the gang members kicks the door and throws over a small table with a vase. You can even hear the sound effect. However a second later the table is standing again.
In the bar scene the Texas flag on the wall is upside down.
After Nick stops the gas truck on his first night as deputy sheriff one can clearly read "Drinking Water" printed on the backside of the "gas" truck.
At one point, near the beginning of the movie, there is a very short outside view of a building. The movie labels it as the "Texas Police Department", but pausing the movie or looking closely you can see that above the the door, to the right of the garage exit, it says "L A P D" in big, white lettering. It looks like the scene was taken from another movie, "Blue Streak", with Martin Lawrence.