At around 1:19:50 into the movie, when Simon goes to "apologize" to Gordo and proceeds to pin him to the ground, the shot shows Gordo surrounded by sheets of paper that fell on the ground. In the next shot he's suddenly not surrounded by paper anymore. The shot after that shows him surrounded by paper again.
When Gordon stays for dinner the amounts in the wine glasses vary up and down even after Simon tells Robyn that Gordo doesn't need any more wine.
The green Gatorade that Robyn takes from the refrigerator after her run is full and unopened. When she sits at the table, the level of liquid has changed. In the next cut, the level is back to the top.
Robyn is holding a sponge with the coarse dark green side facing out, when the camera changes angle in the following shot the green side is reversed.
We see Simon rub out Gordo and starts writing Weirdo and almost finishes while he talks, the camera cuts away and we see him write Weirdo again.
On deliverance room no one uses the cirurgical mask.