Continuity mistake: During the scene where Josh is driving the minivan with the family in it, there is a shot showing the full van and all of its passengers through the windshield. You can see an adult male on the passenger side back seat next to the kids. Josh drove away without the father getting in... who is the male in the back seat?
Revealing mistake: In the scene where Harrison Ford is chasing Isaiah Washington through the building (at the beginning of the chase), Ford climbs out a window and then falls back into a multi-paned window which breaks. As he is getting up, if you look at the top pane of glass (still intact) you can see dents and such making it quite obvious that the glass was fake.
Continuity mistake: After they crash the mustang, a gunfight breaks out. Harrison Ford opens his door and fires one or two rounds - after that the slide of his gun locks back, showing it's empty. The angle then changes, and he carries on shooting with no problems. No time for him to reload.
Plot hole: Calden would almost certainly not be allowed into the autopsy room without some protection: a facemask, goggles, gloves. Not only to protect from errant bodily fluids (as we saw) but also to protect from any infectious diseases those fluids (or any escaping gasses) might carry. Also, he runs the risk of contaminating the evidence.
Continuity mistake: When Gavilan hands Sartain his real estate business card by mistake, he replaces it with his LAPD business card, and slips it exactly in the center between Sartain's fingers. When the shot changes, the business card has moved to the very end of his fingers without him having moved his hand.
Add timeReformed Dispatcher
Continuity mistake: In the scene where Harrison Ford shows up at Josh Harnett's yoga class, at the end when everyone is leaving, Shanna kisses Josh on the left side of his face by his mouth. In the far away shots (over Harrison Ford's shoulder), the lipstick mark is there, however in close up shots it is gone.
Visible crew/equipment: After the scene where K.C. turns around to continue to chase the suspect, who just fell from hiding under the bridge, Gavilan is shown driving a car. When Gavilan passes a set of windows, the reflection can be seen of a crew member sitting in the back seat and a mounted camera on the side of the car.
Factual error: The Los Angeles Police Department no longer has an Internal Affairs division. The division is known as the Bureau of Professional Standards and is subject to civilian oversight - meaning the roughshod treatment Gavilan was receiving at their hands would have been checked at minimum by a civilian review board. That having been said, Gavilan's behavior should have gotten him in trouble regardless of whether or not someone in the department was out to get him.