When George gets splattered with the blood of the lawnmower repair guy and then goes into work, the splatter marks don't match where the blood actually landed.
As Mason leans forward to put his hand on Theo's there is a camera change. In the shot from Mason's side of the table, looking at Theo, Theo's hands are under the table. After the camera shot changes, as Mason is still leaning over to put his hands on Theo's, Theo's hands are now on the table waiting for Mason's hands.
When Reggie and her mom are talking in front of the teen store, two girls behind them enter the store twice between two different shots.
While Roxy says "That old man is your reap, Mason." Mason picks up the spoon. In the very next shot he picks up the spoon again.
When Daisy takes Stan to church, she takes a seat in the fourth row and sets her purse down. After the window breaks, she runs outside, leaving her purse in the pew. When she returns to find Stan gone, the purse is in the fifth row.
In the waffle house, while Theo is talking to the Reapers, Theo is supposed to be completely naked, but clumsy editing clearly reveals he is wearing some type of plastic undergarment.
While stopping at the empty parking lot, after going past Ethan sitting at the outdoor café, the camera closes in on Georgia's Mustang. As it does you can see the camera reflected off the passenger side door.