When the body of the Jogger is found on Jordan's front porch, you can see him breathing.
After RelliK kills Cameron and puts on the mask and gloves, he goes into the same room where Cameron's corpse is laying, but the next shot he's in the bathroom.
When Will is heard talking to Regina on the phone, his audio is normal and then out of nowhere, the audio becomes really loud for the rest of his voiceover dialogue.
When the nerds are going to go over to Sami's house and then chase RelliK down the street, Paul Howard is wearing a white T-Shirt, whereas in the woods in the next scene, he is wearing a red T-Shirt.
When the nerds were chase and fighting RelliK during a thunderstorm at night in the woods, after the nerds returned to Jordan's house, none of them were wet from the rain they were just in.
When the nerds are playing video games, the TV is turned off in some shots with just a black screen showing, but video game noises are heard in the background.
During the main fight scene in the woods of Northward Park, You can see after each nerd individually goes to battle RelliK the other characters standing at the top of the hill awaiting their turn.
When Jordan is about to get into his underwear, you can see for a brief second the arm of camera operator, Abby Young, move into the shot.
When Jamie is going to give the children candy on trick or treat night, in the background you can see all of the children's parents with their phones out to record their kids doing their scene in the movie.
When Jordan is yelling at RelliK, you can see two of the lighting equipment shown shining in the shot. One is seen in a tree and the other on the ground directly behind Jordan and RelliK.