When Grossman tosses the Rubik's Cube to the new guy you can see that it was already solved when he caught it.
Hunsacker follows the van that has struck Jon's motorcycle and the van is missing the driver's side headlight. Later in the chase the headlight reappears and the van appears undamaged.
In real life if they suspected the vehicle abandoned at the side of the road was rigged with explosives, they would have halted traffic in both directions and call in the bomb squad. Detonating the explosives as they did was dangerous, incompetent, negligence,and against every regulation in the book.
When Lina tries to run down Ponch at the bowling alley, the ramp used to propel her car over the other car is visible after she crashes.