Revealing mistake: When Martin Lawrence was trying to get into his car after he supposedly locked the keys in it, you can see in the shot from inside the car that the door was unlocked. You can tell because the orange-red sticker on the lock is showing, which wouldn't be visible if it was locked. (00:10:50)
Revealing mistake: In the part where they are both in the big reds trailers back, the bad guy hits the breaks and the trailer starts sliding to the side. You can see the back wheels of the trailer turning making the trailer slide. (00:44:15)
Revealing mistake: When Hank stops the red station wagon to attempt to commander it, you can see the driver is a different person when it comes up to the person when it is up close. (00:58:30)
Revealing mistake: When the shoot out at the old fort begins, you see bullets hitting the walls left and right. Despite it being concrete, you can see some sort of pink powder in each of the bullet holes. (01:14:35)
Answer: He was thrown in the solitary confinement for another 3 months, which makes it 9 months in prison.