The size and orientation of Sonny Jim's pancakes change several times during his breakfast with Dougie.
When Agent Cooper walks into the casino, the boom operator (complete with C-stand) and still photographer can be seen on the left-hand side in the reflection.
When presented with Cooper's possessions at the Prison, the HK MP5 sub-machine gun on the table has the magazine inserted into the weapon the wrong way around. (Also, while they call it a machine gun, it is technically a sub-machine gun.)