After Blake places Jesse's dead body behind the wheel of the bookmobile, you can clearly see no body behind the wheel as the truck in flames drives off the cliff.
There are various times throughout the film that Blake's fogged eye becomes clear.
When Styles is looking down at Blake's body, he is hanging from a piece of the Towers' scaffolding. However, Blake had stomped on Styles' hand earlier, forcing him to fall and be suspended by his rigging.
When the replay of the situation at the carnival between Nick and Blake is being watched at the office, Nick adds the word "please," which he clearly did not say just seconds before when it happened.
1:31:35 into the film, Ice-T's character Odessa can be seen wearing the Air Jordan 6. However, on 1:37:47, he's seen wearing the Air Jordan 5 from the previous year.
To facilitate his escape, Blake grabs a pistol from a corrections officer. Under no circumstances does a corrections officer carry a firearm inside a prison or jail.
As street cops, Styles and his partner are walking a beat at the carnival without their uniform hats, which are required whenever an officer is outdoors.
During the carnival scene, Styles is holding Blake at gun point with his revolver, when Blake stands up Styles cocks the revolver. From the mid 70's to the late 80's when the LAPD was issuing revolvers, they "doctored" them to not be fired single action, in other words not able to cock the revolver.
When Styles is playing basketball against Odessa near the beginning of the movie, you can clearly see the face of a stunt double with much darker skin, who is driving and slam-dunking the basketball rather than Denzel Washington.
When Styles is getting dressed in the locker room and stands up when the woman comes in the room you can clearly see that Washington is wearing a "modesty pouch."
At the carnival when Blake is thrown over the hot dog cart, the stuntman's face is visible.
When the lead characters arm wrestle their hands are not in the correct positions - fingers wrap around the lower thumb, not the opponents palm.