When Chris comes back to New Jersey and has lunch at the diner with Jamie, the waitress brings Jamie a grilled cheese sandwich with ranch dressing on the side. However, when Jamie trades meals with Chris and passes the plate to him, the cup that should hold the ranch dressing is empty.
In the beginning, when Chris is writing in Jamie's yearbook, he is moving the pen as if he was actually writing the message. However, the words are already written down.
When Samantha is eating the toothpaste she is drooling all over Chris's hand in when he is holding her cheeks, then we he stands up his hand is completely clean.
After Samantha and Mike kiss, Samantha's hands are off Mike when he says, "He's with his lover", but her right hand is seen on his left shoulder in the next shot.
When Chris is in the dental appointment with Clark, you can see that he has a cut on the bottom of his top lip, but in the next shots when he's getting up, his lip is perfectly fine.
When Chris is in the dentist chair, they pop a retainer in his mouth. Retainers have to be made according to a mold of the patient's mouth, you can't just take any old retainer and expect it to fit - it won't.
When Chris is playing the game of pick-up hockey and is going for his slap shot, in all his hokey passes leading up to the slap shot, there is obviously no hockey puck anywhere near his stick. He's just faking it.
When Chris gets out of Clark's car he hits the camera with the car door causing the picture to wobble for a moment.
When Chris Brander is listening to Dusty's music, laboring over his lost love Jamie to the three hot women, they all comment on the music playing but the Sony boom-box says "no disc" on the display.
When Chris, Jamie and his Mom are watching home videos in the living room, in one of the video shots, where there is a close up on Chris' "fat face", you can see part of his fat suit peeling off his chin.
Jamie, Chris and his mother are watching old home movies after their "group date" seeing The Notebook (2004). There's a close-up shot of "Fat" Chris saying, "I love you Jamie Palamino! You're my *best* friend". The edge of the prosthetic mask he is wearing is visible on the left side of his chin.
When Chris is writing a message in Jaime's yearbook, you can see a New Jersey Nets logo. The logo shown is their current logo, which was not used in 1995 when scene takes place.
When Clark and Chris swerve to stay in New Jersey so Chris can confront Jamie, the highway signs read: 24 east to I-78 & Routes1 & 9 East. Routes 1 and 9 only go north and south across the eastern seaboard. The rule of numbered highways in New Jersey are even numbered run east to west, while odd numbered ones run north to south.
Chris gets thrown off a bus that is leaving small town New Jersey. It is obvious it isn't in New Jersey as the building in the background is the historic train station in downtown Moose Jaw.
When Jamie is re-telling the sleepover when they are older, she says she was wearing a white dress shirt. The shirt she was actually wearing was blue.
When Samantha is rehearsing her song "Forgiveness" in the jet, she asks Chris if she should use more vibrato. However, when she starts singing again, instead of using vibrato, she uses falsetto (she sings in a higher voice rather than giving the notes more vibration).