Continuity mistake: During Mike's victory party, at one point you can see Mike in the back holding up a lightsaber. In the next shot when he says "Don't touch the toys," it is now down by his torso. (01:10:50)
Continuity mistake: After the fight with Stan, Mike gets sent to the principal's office. There is a poster behind him that says "Your Career For Life Is" and at the bottom, a star. In the first shot, the poster is above Mike's head, but then in the next shot, Mike's head is covering the star. (00:48:15)
Continuity mistake: When Ned is telling Mike that he will never return to Hayden, he is sitting on a chair with lights that are shining on his cheeks. In the shot from behind, they aren't. (00:25:40)
Continuity mistake: When Ned calls off the Hummer it is immediately in the street behind the Principal, but was completely absent in every shot before that as you can see the street behind her it wasn't there.
Continuity mistake: Just after "Mark" tells Scarlet about Alex's new girlfriend at the victory party, there's a shot of Jane's blue car (headed to Ned's home) as it nears the intersection, which is a short distance away. It cuts to an interior shot of Jane and Ned in the car discussing 'Halo', and through Jane's open window we see the distance she is driving and the side street view. It then cuts back to the shot of them nearing the intersection and two problems arise: one, in the close-up they drive a far greater distance than they do between the exterior shots, and two, the view outside Jane's window differs as well. (01:16:50)
Continuity mistake: After Naomi arrives, as she and Scarlet walk toward the house, when she tells Scarlet, "You got the butt of a 12 yr old boy," Naomi's handbag is dangling on her right forearm and she is carrying her overnight bag in her left hand (viewer's right). However, in the next shot her handbag is up on her right shoulder and she's carrying the overnight bag in her right hand. (00:15:50)
Continuity mistake: In 1989, when Ned walks in, he takes off his brown dungeon-master jacket and puts on a blue sweater. In the first shot, he has it fully on, but when he walks toward the basketball team he is putting the right sleeve on again. (00:01:50)
Continuity mistake: When Ned and Mike are fighting with the lightsabers, Mike hits Ned with his lightsaber and he falls to the floor. When you see the shot of Ned falling, look at Mike. He is only holding his saber with one hand. In the next shot, you see him with both hands on his saber. (00:20:35)
Continuity mistake: After the initial meeting with Principal Masterson, when Ned and Mike, in his bedazzled shirt, stand at the top of the stairs talking about how awful Mike looks, the same teens (girl in a pink hoodie) pass them two shots later. (00:30:05)
Continuity mistake: Scar and Naomi arrive home from happy hour, where Mark is playing 1 on 1 basketball in the driveway. As Naomi exits the driver's side, a small piece of paper falls out onto the floor. In the next shot, it's gone.
Continuity mistake: Before Scarlet's date arrives, during the dance when Mike spins her in his arms, in a few shots Scarlet's hands are atop one another on Mike's shoulder and her bracelet is at her wrist, but in-between those shots in one shot her hands are apart gripping his shoulder and her bracelet is up on her forearm. (00:56:45)
Continuity mistake: After being accepted to Hayden High, when Ned says, "You always had my back in high school, if your spirit guide...," Mike's left hand is up at his mouth in the shot facing Ned. In the next shot Mike crosses his arms, but when it cuts his hand is back up at his mouth. (00:30:30)
Continuity mistake: During Mike and Ned's lightsabre duel, when Mike kicks Ned just after Ned says, "Covered by the local news," the chair in the kitchen behind him faces the foosball table (in the next room) with its back against the counter, yet in the previous shots that chair faces the front door. (00:20:20)
Continuity mistake: In the school cafeteria, when Mike and Alex first sit at the table Mike and his tray are directly opposite Alex, but next shot they are seated diagonally to one another with Mike at the end of the table, then they're opposite each other again, and the tray's position still changes between camera angles in following shots. (00:36:20)
Continuity mistake: When Mike and Ned are in Principal Masterson's office and she says, "I think Hayden would be lucky to have you," she stands up and removes her eyeglasses, but when she shakes Mike's hand she is wearing the glasses, and next shot they're off again. Then yet again, when she sits back down she is wearing them (in the foreground), just before Ned asks, "Would the lady mind if I smelled it?" (00:28:50)
Continuity mistake: While Ned and Mike are waiting for the school secretary to get off the phone (for enrollment), when Mike opens the folder the faked science fair photo is at the top of the pile on the right. In the next shot, there is a photo on the left leaning on the inside of the folder cover and the science fair photo isn't at the top of the pile on the right, but when it cuts there are no photos on the folder cover. Then Mike closes the folder, but next shot it's open again. (00:26:10)
Continuity mistake: When Scarlet leaves with her date, Mike is holding her bouquet of flowers and the direction they face changes between the front and back shots - note the two tall purple Liatris flower heads. (00:58:30)
Continuity mistake: When Ned and Mike are in Principal Masterson's office, as she reviews Mike's transcripts there are some open pages on her PC screen, but in her close-ups the screensaver is active, then it's back to the original screen. (00:28:20)
Continuity mistake: In the ice cream shop, after Alex tells Mike that Maggie got into Georgetown, in the side shot when Mike leans forward to pick up Maggie's earpiece wire he asks, "Can you turn down the...," but his mouth doesn't move, and then in the next shot he leans forward once again to pick up the wire. (00:13:05)
Continuity mistake: During Mike's slapfest, given by Scarlet, Maggie and her three friends, when the blonde slaps him she turns toward her left to walk away, but in the next shot facing Mike she turns to her right to walk away. Maggie did the same thing, but the opposite way. (01:19:10)
Answer: I've not seen the movie, but an ex-wife would be closer to her ex-husband than a coach to his old student, no matter how good.
JonTheRandom