While it is possible for bacteria to cause the blood alcohol level to rise significantly post-mortem, it takes several days. Here, they weren't even done clearing the scene of the accident when they measured it.
While searching the SUV for fiber traces to determine who was driving, a fiber caught in the plastic below the driving column. Calleigh then clips a thread from the daughters pants to compare with the fiber and finds a match. The problem is that the thread that was cut was from the stitching, not from the fabric of her pants. Pants manufacturers use different thread in stitching together pants than the thread that is used to make the fabric. Thus comparing the stitching thread to the thread they found should not have produced a match.
Calleigh found the female victim's eye a long way from the accident. How would an eye pop out in a car accident? It would have to be physically removed.
The story revolves around trying to determine how the accident happened and who was driving. This proves difficult because no one was wearing a seatbelt in the Escalade so that the daughter is ejected from the driver's side when the vehicle flips and the mother ends up on the driver's side. But in the flashback, the daughter is wearing her seatbelt and could not have been thrown from the vehicle.
"Greg, you inadvertently cut the cable," Horation tells the suspect, but he is talking about a hose or line (for the power steering fluid).