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Continuity mistake: At Thor's party, Max's hair (bangs) changes a few times. His bangs can be combed to the right or some strands are horizontal across his forehead. Sometimes he has a gap in his bangs on the right side and another time there is a gap between his bangs and sideburns. (01:20:13)

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Continuity mistake: Throughout the time the Good Boys are in the school's bathroom, Max's collar is sometimes partly under his jacket / backpack strap and other times it is not. (00:30:37)

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Continuity mistake: Near the end of the movie when Mason is talking to his dad on the phone, the position of his right index finger varies with front or back shots. Front shots show Mason's index finger held almost straight up along/against the side of his cell phone. Rear views show Mason's index finger curved around the side with the fingertip pressing against the middle back of the cell phone. (01:57:48)

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Continuity mistake: As the years pass, Mason dons a different haircut/style, but there is a period of time during which a particular haircut inadvertently varies in length, being shorter, longer, shorter, etc. within the same scene or day (as opposed to showing his hair gradually or naturally growing over several weeks). From the time he was picked up by his father until he is back home and step-dad Bill makes him get an almost-bald haircut, Mason's hair vacillates in length from above to below his shoulders and shorter or longer bangs.

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Continuity mistake: Mason, Randy, and another boy (who is carrying a skateboard in his right hand) are each carrying a can of Coke while walking home from school. When the boy changes the skateboard to his left hand, he no longer has the can of Coke. (00:27:12)

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Continuity mistake: When they are playing Xbox, Mason and Randy are leaning against their chairs and their heads do not reach the top of the back of the chairs. A view from behind the boys show one of their heads (appears to be Mason's) in the open without the chair or its back visible. (00:27:50)

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Continuity mistake: Mason Sr. has a pack of cigarettes in the left pocket of his shirt when looking at Mason Jr's arrowheads but the pocket is flat after he looks at something of Sam's. The cigarettes are back in his pocket when he goes to talk to Olivia. (00:19:54 - 00:20:37)

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Continuity mistake: When the Good Boys get to Thor's house after leaving school, there are three bikes lying on the ground near the front steps (to the left), but the bikes are not there when Claude leaves with the "CPR doll." (00:31:24 - 00:35:00)

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Continuity mistake: At the skate park, when Atticus asks Max and Thor if they want to see something, Atticus has three friends with him but only two of his friends show up in the woods where they sip a beer.

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Continuity mistake: After Max's dad tells him he is grounded and the Good Boys fight/argue, Max walks away without his backpack (and the Drone's box, which would contain the recharging base, instructions, and warranty information?). A little later, Max is walking along the road with his backpack on.

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Continuity mistake: During the lunch scene when Soren is asking Max to his kissing party, the background changes and the placement of the table in relation to the double doors varies. The kids sitting at the table and Max standing do not move. Sometimes the background (behind Soren) is a solid wall with posters and other times it appears to be the cafeteria counter with microwave ovens and/or available foods (e.g, oranges, ketchup, mustard). The table is perpendicular to the double doors but a little later the doors are at a slant.

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Continuity mistake: At the skate park (which is supposed to be Thursday after school), Max is wearing the clothes he wore on Wednesday and Friday - not the clothes he wore in school on Thursday.

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Continuity mistake: At the sleepover (supposedly, Wednesday night), the Good Boys are supposed to go to the skate park the next day after school, but they are there before they are in school on Thursday.

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