When Mr. Wrench and Mr. Numbers are at the diner, the mustard bottle is knocked over on its side and there is no menu visible at first. When they are arguing, the bottle is suddenly upright next to the ketchup and a menu appears against the wall, until Mr. Wrench pounds his hands on the table, at which point he knocks the bottle over and causes the menu fall to the floor behind the table and disappear, restoring the table to how it appeared earlier in the scene.
At the diner, when Lou stops by Mr. Wrench and Mr. Numbers to check how they are doing with their meal, the amount of coffee in the pot he is holding decreases and then increases in between shots.
When Mr. Wrench is running the auger it is obvious he is not trying to dig a hole in the ice and the spindle is just spinning.
When Grimley arrests Lester, he puts the handcuffs on him and places him in the car, but does not read him his rights.