When Horatio first goes into the bathroom at Bar 212, where the murder took place, the pattern of the blood on stall door changes as the camera angle moves from inside to outside the stall.
Walter is in the lab and runs out into the corridor, he shouts calleigh and speaks to her, but it is not calleigh it is Boa Visata. So either be said wrong name or it was originally Caleigh that was meant to be in that scene and replaced by Boa Vista and no one changed the script.
The desk phone that the receptionist at the Biotech company uses is unplugged you can see the empty socket on the rear of the phone.
Horatio turns of the tap at the murder site with his bare finger.
This is before finger printing has been done as all surfaces are still clean with no finger print powder seen .