As the party ends at the Pit, while everyone is leaving there is a shot of Samantha on top of her Aunt's car attempting to fix the windshield and/or wipers. Yet the very next day when her and Droz are walking off to get coffee and Samantha says she has a car, she acts as if she is unaware of the damage that has already been done.
When dumping the meat on the Cause Heads, the pan full of meatballs turns into potatoes when they get thrown out of the window.
When McPherson picks up party flyer, he folds it once lengthways, then once crossways. When he unfolds it later, it is folded twice lengthways.
When Droz inserts the CD into the machine it has a blue display. However, in the long shot the CD player has an orange display.
The band is practicing and the fuse blows. When the young girl leaves the room, you can distinctly hear the television playing in the background.
The "whooping crane" in the cage is actually a crowned crane.
A full beer keg is much too heavy for a single person to lift over their head. While it's possible that these aren't full kegs, but merely kegs that haven't been finished (beer can be heard sloshing around in them, which can not be heard in a full keg), due to the movement of the liquid inside a half-full keg is nearly as awkward as a full keg. Either way, the kegs could not be lifted overhead.
Tom is on his way to school for the first time, but when he gets off the bus all he is carrying is a small backpack instead of a suitcase or more.
When Tom holds Katy and kisses her while dancing at the party, he calls her Megan, the actress' name. He should have called her Katy.