Factual error: When Mac is held hostage until he can prove that the bank robber did not shoot the manager, he asks for a portable CT machine to be delivered. CT stands for computed tomography which is a machine that takes slice pictures of the body and puts them together to form a whole image. This is why a CT machine has a tube like quality to it, so it can take slice-like pictures around the body. When it arrives the machine is not a CT at all, but an ultrasound. This is made obvious when Mac uses the transducer probe (wand-like attachment) to scan the body. Anyone who has had any of these procedures done, or has seen them in TV shows, or knows how to search images on the internet can see the difference between these two very different machines.
Continuity mistake: when the bank manager's wife is being prepared for autopsy, Sid begins by taking pictures of the wife. In these shots you can see her wrists and ankles are bound with tape. First he cuts off the tape on the ankles and places it in the evidence envelope with Danny and Lindsay. Next he begins to cut the tape from the wrists. As he is doing so, the next shot cuts to a full body view of the wife in which she has the tape back on her ankles again.
Other mistake: The body in the bank has one entry wound because the gun has no kickback, but in the flashback of the manager getting shot the shooter pushes the manager back then shoots him twice, the managers body moving alone would have causes the two bullets to enter at to different points.