Revealing mistake: When Fi triggers the bomb under the car, in the shot showing the explosion, the bomb itself, with an obvious red flashing light, has disappeared, plus the explosion originates from within the car, rather than underneath where the bomb was placed.
Factual error: When Fiona slips Michael a "key" during their kiss, Michael keeps it and no problem. In reality, all prisoners are searched thoroughly before returning to their cells. This includes a full oral search.
Continuity mistake: When Hector, Caleb, and Michael walk to the back of Caleb's house looking for the GTO, they discover it behind the greenhouse. Caleb tells Hector he'd never steal from him. Hector gets in Caleb's face and says, "You mean, you never will." Here, Caleb is shown from the front. When Hector says "again," Caleb is shown from behind, and he has sweat running down his cheek. When Caleb is shown from the front again, Hector says, "Take him inside," and there's no sweat on his face. (00:35:40)
Continuity mistake: At the end of the episode, before the SUV rolls, it is a new Escalade. However, during and after the roll, it changes to a first generation Escalade.
Continuity mistake: When Michael has his gun on the dirty cops head, the gun is resting on his forehead and Michaels hand is on his throat. In the next shot the gun is right between the cops eyes, and his hand is on his chest. This keeps going back and forth a few times.
Last Stand - S4-E18
Revealing mistake: After Michael blows up his car, the bad guys' car hits it and pretty clear jolts to a near-stop. In the reverse angle it suddenly smashes over the top of the burning vehicle at great speed. Not to mention that without a ramp there's no way it could have jumped the wreck anyway.
Chosen answer: It might not actually have one, in which case, he'd have to go down into the club and use theirs. As for showering, going to his mother's house or a gym membership would take care of that.
Captain Defenestrator