Before the final LAIRE battle Danny is explaining who Marvin Hamlisch is. He says that he is the guy who wrote the music for The Sting. Hamlisch adapted, arranged, and conducted, but did not write any of the music for The Sting.
When Danny sits down with Beth in the coffee shop, he points out that he got her a venti chai. A few minutes later, when she is arguing with him (and even though she has barely touched the drink) she moves the cup, which is obviously empty.
In the beginning when they are in the minotaur shaped car going from school to school promoting minotaur energy drinks, Wheeler has his helmet off which switches from being in his lap to the back of the car when switching angle views.
During Danny's party at work, an extra (a black man with dreads) can be seen standing behind him while he's speaking. When the camera switches angles the same man is seen walking in front of Danny, and when the camera cuts back to the original angle, the man is back where he originally was.
When Augie is looking at the LAIRE page his computer says it is 6:38pm on Tuesday evening. The page indicates the LAIRE Battle Royale is set to begin in 10 hours. This would mean the event would begin at approximately 4:38am Wednesday morning. However, Beth later reveals that the Battle Royale is in direct conflict with their 3pm court date.
When Danny goes to stand up to the King in the Burger Hole, there is no body in the booth behind them at first, then in a different shot, there are people, and then in the next shot, there is nobody yet again.
When Danny flips and gives his speech about how life sucks and his dead end job, he walks off stage at the end holding a can of "Minotaur", when the angle cuts to a wider view, Danny is no longer holding the can and the stage floor is clear.
In the scene that Ronnie locks Wheeler out of the car it raises suspicion about whether that older model of Bronco has power locks. Later you can see that there is not a power lock switch in the vehicle.
After Danny leaves from having dinner with Augie and his parents; Augie's Step-Dad puts Danny's napkin on the plate and his chair tilted up, in the final shot of the scene, the napkin is not on the plate.
After Beth breaks up with Danny, when he is giving his speech about Minotaur, he is talking about how life sucks. At the end of his "speech" he throws the microphone on the ground. When the camera backs up, the microphone is on the stand again.
The scene where Wheeler and Danny went to the initial meeting for their community service, everyone was sitting down when Gayle Sweeny was talking in front of the television, which was turned off, but in the glare reflection you can see a person in the background holding a clipboard and then she quickly walks off the camera's sight.
On the first day out with the kids they are driving them home to their houses in the jeep with the top down. Pylons closing off the road and trailers can be seen down one of the streets that they go by.
The goof item below may give away important plot points.
At the battle field at the end of the movie, Wheeler sacrifices himself to save Danny from one of the bad guys. As Wheeler and Danny are having their "final" talk Danny's hair moves in front of his left ear, to being brushed behind it. The problem is, it never shows Danny pushing his hair behind his ear.