After Jared leaves the bathroom a hideous mess, Arbie calls it to Denny's attention. When Denny hands to mop to Arbie to clean it up, the mop is really dirty. When Arbie begins to clean, the mop is spotless.
On the ride back home at the end of the movie, Arbie offers a little girl a beer can to drink; drinking alcohol is dangerous for kids and teens and sometimes for adults as it can do serious damage to their bodies. Because alcohol can cause such problems, the citizens and government leaders in the United States decide that kids shouldn't be allowed to buy or use alcohol.
Before the restaurant explodes in the finale, the color of the restaurant on one side is clearly dim revealing that a photograph was actually placed in front of the building to match it up and then was blown up. This can be noticeable in a few frames, twice.