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.
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.
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.
From Simon's point of view, Robyn holds a coffee cup in her hands. When Simon is saying something like "...want to told you, but you were unconscious", the view switches to Robyn's one, and the cup is not there. It reappears in the next scene.
When Simon erases Gordo and writes Weirdo on the fridge instead, the handwriting style changes between each takes.
On deliverance room no one uses the cirurgical mask.