Continuity mistake: In the Cadillac chasing the mortuary van, as they break through the fence gate heading towards the railroad tracks for few seconds the Cadillac has a front license plate bracket, most noticeable when the water tower is directly in the background. The rest of the chase, it doesn't.
Revealing mistake: After Mike starts shooting at the KKK meeting he rolls on the ground as he's firing at klansmen, and when it cuts to shots facing those klansmen, the stunt springboard is visible in two consecutive shots. (00:08:30)
Other mistake: Marcus and Mike go into Phat Audio Video to review the video camera that they retrieved from Zoe Pounders' house. Police stations have video equipment, they could have watched it, there. For that matter, they could have watched it at Zoe Pounders' house. (00:53:25)
Suggested correction: All that doesn't contribute anything to the plot. The point is they watch the video, the rest is intentional for comedy effects. Not a plot hole at all.
Factual error: In the final Cuba scene they fly from Miami to Cuba but nowhere near Guantanamo yet they drive just a few minutes out of town to the base. GTMO is 520 air miles from Miami and 520 from Havana.