Revealing mistake: In music class, the position of Max behind Lucas would not enable Max to see Lucas' face to know he was crying or ask "what's wrong?" In this part of the scene, Max appears to be green-screened and his eyes are focused too far left of the back of Lucas' head (not just face); he would be lucky to be able to see a part of Lucas' left ear. (00:09:58 - 00:10:32)
Character mistake: At the skate park, Thor said he wasn't into girls because "girls are a distraction." Thor was interested in going to Soren's party because a lot of the popular boys were going to be there. When the "spin the bottle" landed on Thor, he said he couldn't kiss Brixlee and went upstairs. Hannah and Lily came home and told Thor it was OK that he wasn't ready for a kissing party and still had a lot of time before becoming interested in girls. Max previously told Thor that he wasn't as mature (sexually developed or undergoing puberty). Therefore, Thor's statement in the cafeteria about his new earring - that he "wasn't going for cute", he was going for "sexy and hot" - was incongruent and incompatible with his character.
Revealing mistake: Benji was talking to Hannah in the back yard near the swimming pool and many feet away from Hannah's house. Eventually, a large white beam or horizontal area appears behind Benji's head. Although this doesn't make sense, it apparently is meant to be the overhang of the house. Benji was too far away from the house to be "under the overhang" plus the overhang is not nearly that wide. (00:19:40)
Continuity mistake: When the boys go into the woods to "sip a beer", the background changes several times. Most noticeably, there is a graffiti-painted wall or boulder that is clear, colorful, and directly behind ALL the boys on at least two shots. In other shots, the wall is completely missing, only partially visible, or very pale and at an angle.
Continuity mistake: At the skate park when the camera is on Max, Thor, and Lucas (in that order, on their bikes), the background changes a few times. The houses (which might change) and cars passing on the road show that the road is closer or further away and/or at an angle. People behind Max disappear but reappear in the same spot with camera changes in direction. When Max rides his bike a little ways to talk to Taylor, the pavement changes in color (painted areas).
Continuity mistake: At the store, when the background looks pale and at a slant (indicating the use of a green screen), the man behind the counter makes the same head and eye motions on two occasions (obviously taped) and his eyes don't appear to be looking at the "live action" - he appears to be somewhere else (like on a pre-recorded tape).
Continuity mistake: After the drone gets smashed by the school bus and the Good Boys run across to be facing the school, the background changes a few times. For example, students who are standing together behind Max suddenly disappear, but are back in the same spot when the camera changes direction again.
Continuity mistake: The position of Max's legs/feet change a few times when he is lying on his bed, varying with his dad entering his bedroom and leaving. Max's feet are in the air (perpendicular to the bed) right before his dad comes in but are crossed and flat against the pillow when he enters. When Max's dad rises from sitting on the bed, Max's feet are in the air again but are down on the pillow again when his dad is at the door leaving.
Revealing mistake: A stunt double was used for Lucas flying off his bike and into the side of a delivery truck. The legs are obviously thinner; Lucas isn't that "thin." Even though movie goers could assume that a stunt double would be used in this situation, the director / producers apparently did not even try to make the stunt double pass as Lucas - and all they needed to do was make the stunt double wear bigger pants (Lucas' size) and add padding. (00:36:58)
Revealing mistake: The use of a green screen (or other color) during most of the cafeteria scene is obvious if you watch the people in the background instead of the main characters and is flawed in a few ways (e.g, varying angles, greater distance, continuity of a person, etc). For example there is a man wearing a blue shirt/tan pants and carrying a briefcase walking down the aisle toward the Good Boys' table. When the man is walking along the wall that is behind the Good Boys, he is further ahead than he is when he is picked up again. Also, this man shows up in front of Max when Max is walking to Soren's table. The man also appears walking along the back wall with a woman. Watching the wall behind Thor and Lucas, it is sometimes at an angle and other times looks more distant. Some of the people would essentially be walking "out of the wall" in order to appear where they do (e.g, the boy with a backpack).
Other mistake: The mirror on the bike that Lucas is riding when fleeing from the girls is near the center of the handlebars and pointed toward his chest at a slightly upward slant. Given how far away Lily is (and at ground level), the mirror can't be capturing her image like it is shown (or at all, for that matter). (00:36:28)
Other mistake: The story starts about two weeks into the school year, making it late August or early September. Max's dad got home early, some time before 5:00 PM, and Lucas was at Max's bedroom window a little after the two hours he had been home from the mall, so it was now some time before 7:00 PM - too early in the evening for it to be after dark walking to Soren's house for the "kissing party." Timewise, the foliage also doesn't always sync. Sometimes, all the trees are lush green, other times the trees have partly or already turned orange, and when Max removes the drone from the box after the girls drop the Good Boys off 1.7 miles from home, there are fallen orange leaves on the brick pavement.
Character mistake: Lucas says he loves "Ascension, rules, and anti-drug campaigns", so would not be likely to encourage Max to go to Soren's party after his father grounded him... or ask what his father would do about it (double-ground him?). Even though Lucas tells Max that he has "grown a lot" in the two hours after getting home and talking to his parents about all that happened that day (which they didn't believe), we aren't told in what way(s) he has grown - but it would not be favoring violation of rules. Also, Lucas later tells Hannah and Lily at Soren's house that he loves "Ascension, rules, anti-drug campaigns, and grilled cheese." This indicates that his view on rules has not changed, reinforcing the assertion that it was out of character for Lucas to encourage Max to go Soren's party while grounded.