Blooper

Immediately after the fight at the party ends, Schmidt's back has no stab wound. A few shots later, it's revealed he has been stabbed.

When Schmidt and Jenko first open the door for their party, Zack, Roman, and Delroy are on the other side. Zack and Roman walk in, and the door closes. Delroy never walks through the door.

When Jenko writes on the board in AP Chemistry after he takes the drugs, he writes with a piece of chalk. When the camera angle changes, the board is a whiteboard, with writing in marker.

After the gun fight at the hotel, Jenko vomits on Schmidt's white jacket. Later in the next scene, the vomit on the jacket is gone.

Schmidt and Jenko walk through church doors that are covered with old newsprint, which disappears as they enter the church.

The officers' mistake at the beginning is not accurate. A police officer is never required to read a suspect their Miranda rights. Miranda rights only become relevant when a person is in custody and being interrogated by the police. Then even if you are not read your Miranda rights, the only consequence is that the police cannot use anything you say as evidence against you.

Eric received early admission to the University of California at Berkeley. In real life, none of the University of California campuses allow early admission.

The process of expelling someone from a public school isn't immediately completed the way it is show in the movie. The decision could be appealed at several levels before it was confirmed. And in many cases, the students would be allowed to remain in school during the appeals process as long as the situation didn't involve any crimes (which didn't apply here, as Jenko and Schmidt were expelled for fighting during a school play).

The music teacher doesn't intervene or kick Jenko out when he disrupts his class and even destroying some of the instruments.

During the limo chase, Jenko mentions covalent bonds in context of lithium batteries and potassium nitrate. A bond involving metals would be ionic, not covalent.

However, Jenko might not have mastered the whole concept involved yet, and this is clearly played for laughs.

Firing a gun in the air wildly like Schmidt did in the park scene would be grounds for immediate termination in most police divisions.

However, this is clearly played for laughs.

During the motorcycle chase, one gang member shoots a gun with his right hand while appearing to accelerate. The throttle control is on the right handlebar.

Much of the Korean writing in the church is grammatically incorrect, the type of translation produced by online translators. For instance, the Korean version of "Aroma of Christ Church" has Christ Church as the possessive of the word aroma, i.e. "Christ Church's Aroma" or "The Aroma that Belongs to Christ Church".

The rearview mirror has been removed from the Hyundai, the Ford Mustang, the Porsche, and the red Mercedes.

When Jenko is playing with chemicals with his friends blowing stuff up, he gets a bit of the chemicals on his hands. When the guys run away from the bomb, Jenko can be seen touching one of the boys' arms. Covered in acid, this would clearly cause a reaction.

Obvious mannequin gets its legs rolled over by the truck.

Eric tells Jenko that he doesn't trust him because he looks 40. When he says "After a stunt like that, there is no way you can be cops," his mouth doesn't move.

Jenko does not hear the biker come onto his left before he shoots at him at 1:14'.

The paramedic does not remove the venous tourniquet he just put on Molly's left arm before leaving her and Schmidt to have their chat.

The paramedic did not prepare any material for a venous puncture (used for fitting an intravenous line) before setting a tourniquet on Molly's left arm.