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.
Other mistake: From the outside, the chimney on Max's house is rectangular but is square (or almost square) when the drone is going down it. (00:59:03)
Other mistake: At the playground across from the school (Friday morning), Lily demands that the Good Boys give back the Molly pills. After Thor informs the other Good Boys that Molly is a "sex drug", Lucas screams to the girls, "You had us bring f-ing drugs to a playground? There are children here." Actually, Max was the one who told the girls to meet at that location. Max may not have been aware of the drugs, but he - more so than the girls - was responsible for picking the location. It is also noteworthy that Max and Hannah were neighbors. They could have easily agreed to make the drone-for-purse swap early that morning before going to school. Without Lucas, Thor, and Lily present, there would not be Lucas' concern that the girls might "trick or overpower" them. Max would have the drone back in place before his mother or sister noticed it was missing, he would not have to keep it safe all during the school day until he got home, and Lily would have her phone, driver's license, etc.
Other mistake: When Max finally kisses Brixlee, a green screen is understandably used to show kids watching in the background. However, it is a giveaway - Taylor's eyes, in particular, aren't quite focused on Max and Brixlee... or anything else there.
Other mistake: The paintball gun was too big (length and width) to fit inside of Max's backpack, and it didn't look like Thor was going to be able to get the paintball gun completely in and zipper the backpack closed. After Lucas dislocates his shoulder, Thor goes into Max's backpack to get the mouth gag and there is no sign of the big paintball gun. The backpack also did not appear to contain the paintball gun when the back side of Max was shown before going up the steps to the frat house. For the record, none of the Good Boys was shown putting the mouth gag into the backpack; Thor did put the face mask in the backpack. (00:32:54 - 00:38:50)
Other mistake: The bedroom window (wall opposite of Max's bed) presents a couple issues. First, from the opening scene, Max's bedroom is on the second floor of the house. How Lucas is able to stand outside of this window (to get Max to go to Soren's party) is problematic. There appears to be a trellis to the left of Lucas, but it would not enable Lucas to get up to or stand outside of the window. His height relative to the window sill on the outside is also questionable. Second, when Max first stands up, the window sill is neck-high to Max (who is slightly on his tip-toes). Next, Max is standing by the window and the sill is a few inches below his shoulders. The height of the window sill relative to Max varies a few times (and isn't merely due to the camera's angle). (01:05:15)
Other mistake: Based on the license plates, the Good Boys live in Illinois. Public schools have an attendance policy and require parents to inform the school if a child is going to be absent. If the parent/guardian fails to contact the school, the school will try contacting the parent at home or work, usually within about 2 hours after the student's absence from his/her first class. The Good Boys could not have skipped school without getting caught. Thor's mom apparently did not know that Thor was absent because she told him that Max's mom told her that Max skipped school and went to the mall by himself - and asked Thor to promise her he wouldn't do anything so stupid.
Other mistake: Max is shown at the skate park during the time he was grounded (a month in the hole). In Chapter 18, Thor is auditioning and practicing, Brixlee breaks up with Max at school, Taylor becomes Max's new girlfriend, and Brixlee and Taylor are together at the skate park. Max should not have been at the skate park because his "30 days in the hole" didn't end until the day before the "Rock of Ages" show (where Scout is as Max's latest girlfriend). At Thor's backyard celebration after "Rock of Ages", Max tells Thor and Lucas that it seems like they haven't talked for weeks. I think this was supposed to be funny in that Max was grounded for four weeks, but Max was not completely cut off from his friends - surely they were able to see and talk to each other during school hours, just like Max was able to make new girlfriends.
Other mistake: At the skate park (which should be Thursday after school), Max says that the necklace he is making for Brixley isn't in the kiln yet. On Friday, after Max's dad tells him he is grounded and Lucas shows up outside of Max's bedroom window, Max tells Lucas that the necklace is still in the kiln. The Good Boys went into the boys' restroom when they got to school and soon left to go to the mall, so there was no time for Max to put the necklace in the kiln - or for him to know that it was in the kiln.
Other mistake: In a deleted scene, Hannah wants to spend time with Lily because Lily is leaving, although her destination is not revealed. Lily's brother Soren and her mother apparently aren't going anywhere, so it didn't make sense that Lily would be leaving two weeks into the public school year. Additionally, Hannah and Lily have been best friends and in the same class since eighth grade. Therefore, instead of saying, "Tomorrow I'm skipping school", "Hannah should have said, "Tomorrow WE are skipping school..." It seems like the writers decided to abandon the idea that Lily was going somewhere but the rest of her family wasn't and she was somehow not under the same school schedule as Hannah. However, they forgot to add Lily to the skipping school idea that Hannah was going to do so that they could spend more time together. (It wouldn't make sense for Hannah - but not Lily - to skip school). (00:17:56)
Other mistake: Mr. Newman (Max's dad) automatically assuming that Max was to blame for using the drone and wrecking the room can be viewed as a mistake when certain factors are taken into consideration. In the opening scene, Max and his dad are presented as having a good father-son relationship; Mr. Newman even refers to Max as his "buddy" and says he is proud of him. Max tells his dad he won't touch the drone. When Max's dad calls to tell him he will be home early, Max sounds cheerful and does not let on that anything is wrong. Hence, it would make more sense for Mr. Newman to believe that Max's little sister was responsible for the mess - she would be less likely to know how to use and steer the drone, causing a lot of damage in the room before she could get the drone under control or the drone crashed. Why Max never bothered to worry that his mother (or his little sister, for that matter) would notice that the drone was missing is another flaw.
Other mistake: Max was supposed to be more developmentally mature than Thor and Lucas and going through puberty but there were no indications of this. He still had a child's voice, did not have any facial hair (or "pubes"), and did not appear to have started a growth spurt. Even though he had hormones raging through his body, he did not have one pimple (zit). [Make-up artists have put zits on many adults to make them look younger in teen movies.] The co-writers deliberately used 12-year-olds to make them look the part and convince the audience that they were naive, but Max, especially, did not look the part.
Other mistake: At the party, Max did not have anywhere from which to pull out the "necklace" (anal beads) to give to Brixlee. It apparently was not in his pants' pockets or his little leather jacket, and he did not have a backpack with him. The beads were simply too big to have hidden them under his clothes.
Other mistake: Near the end when the Good Boys are fighting/arguing, Max tells Thor that he skipped the "Rock of Ages" audition because he didn't think it was cool. Thor missed the audition because Max got him and Lucas to skip school in order to go to the mall and buy a replacement drone.
Other mistake: Hannah's bag (purse) never reappeared and after the first day when she said it contained her license and phone, she never asked for them again! What 17-18 year-old would not be concerned about her driver's license or cell phone? The next morning at the playground across from the school, Lily even said, "Give us the bag or I will hurt you." Hannah was driving without a license.
Other mistake: If the Good Boys gave the cop the Molly in the vitamin bottle, where did they get the vitamin bottle they gave to the girls in the mall parking lot?
Suggested correction: They got it from Benji when the girls dropped them off at the frat house.
Other mistake: The amount of time that lapsed between the Good Boys leaving/skipping school (around 8:00 AM?) and Max's dad calling to say he'd be home early (some time before 5:00 PM) was excessive. Even if it took the Good Boys two hours to get to the mall, they got a ride halfway home and had 1.7 miles to get home. If it was now around noon (?) or within school hours, why would Max's dad call him to say he was going to be home early? If it was closer to 3:00 or 4:00 PM, where were the boys after leaving the mall, especially since they wanted to get back ASAP to replace the drone at home?
Other mistake: When the Good Boys are riding from the mall with the girls, Lucas says, "Everyone knows you meet your best friends in kindergarten", implying that's where the Good Boys met. However, in an earlier scene, Lucas told Claude that he met Max and Thor "the summer he moved there" and they started a dog-washing business and made $8.00 which they used to buy the Ascension cards. (They wouldn't be in kindergarten in the summer or be old enough to start a business).
Other mistake: The double-sided dildo used to hold the store's door closed and keep the cop inside was not among the "weapons" that Thor found in his parents' closet. Where did it come from?
