When the agents are talking to Smitty at the bar his bottle of beer moves from 1 coaster to another between shots and he's not picked it up.
In the opening scenes, the young Billy Doyle is taller and slimmer than Alden Parker. As adults, it's the other way around. Doyle is shorty, stocky and overweight but Parker is tall, slim and muscular.
Kasie said "The killer applied a transdermal patch called DMSO or dimethyl sulfoxide." DMSO is not a patch: it is a chemical compound. The patch is just a patch but it *contains* DMSO, a solvent which can pass through the skin, taking any dissolved substances (such as poisons) with it.
Parker said that, in juvie, he was scrawny and needed protection. However, the opening shots show the young Alden Parker as medium build, maybe slightly chubby.
In the opening surgical scene, nobody in the O.R. is wearing eye protection, and they are all wearing cheap procedure ear-loop masks and not proper, real surgical masks.
When Parker is exiting van, you can clearly see camera crew in window reflection.
Kayla would not be able to tell if the doctor's ribs were broken just by looking at him, as he was presented in the scene.