Continuity mistake: In the last skiing scene where Lane is being chased by the paperboy, when the camera is on Lane he has the sleeves to his vest on. The camera then goes to someone else and when it comes back to Lane, there are no sleeves on the vest, then they are back on again later.
Revealing mistake: When Lane becomes depressed he goes out to the garage and ties a red cord around his neck and to the ceiling to hang himself. He thinks better of it, but his mother opens the door and knocks him off the steps and he hangs by the cord. If you look closely you can see that there is no cord hung around his neck, he merely holds his hand up and mimics grabbing the cord around his neck. The cord seems to be attached to something on his back.
Continuity mistake: Lane goes to his first day of work at "pig burger". A closeup is shown of the owner's mouth as he snarls "Myers...". There's about 1/4 inch of facial hair all over his face. When they cut from the closeup and show the rest of his body you can see that he's fairly well shaven, only some 5 o'clock shadow.
Factual error: After Lane finishes fencing with Ricky he carries Monique to his car - we see their feet as Monique gets into the car, then a split second later Lane gets into the drivers seat, the car starts and the they drive off. Trouble is, they are both wearing their ski boots, and there is no time in the sequence of shots for Lane to change footwear. Nobody, anywhere, any time, can drive in ski boots.
Factual error: A native French speaker like Monique would never mistake the word 'testicle' for 'tentacle'. The French word for 'testicle' is 'testicule' and the word for 'tentacle' is 'tentacules' - both are pronounced almost identically to the English form. She'd have to confuse the two words in French, and not even a non-English speaking French person would make a mistake like that. Monique's English is very good. She'd be perfectly aware of what she was saying.,.
Continuity mistake: In the scene where Monique is introduced to Ricky at in the movie you see Ricky remove the red cap of his nasal spray and drops it as he goes to spray it in his nose. When the Camera zooms in on the next shot of him snorting nasal spray you can see him drop the red cap again.