When they ask Kyle Preston what's happened to his finger, he says that he cannot fold his finger, since he was hurt during a basketball game. But previously during the interrogation, we see Kyle having all his fingers folded.
Horatio comments that wisdom teeth erupt when you're 18 years old. Wisdom teeth generally erupt between 17 and 25, but there are cases of them erupting much earlier and much later. So it is entirely possible that Ashley/Kathleen could be 21 without her wisdom teeth having erupted yet.
Ashley Anders birth certificate reads Minnesota as county of birth. Minnesota is a state.
When Alexx is cleaning the deceased Ashley Anders' face, her lips move. While slight opening of the mouth (as happens here) might occur due to downward pressure on the chin or lips, the sponge is clearly moving across her face and not putting any pressure on her chin or lips at the time they open.
Horatio asks Alex to determine the age of the dead porn star Anders. Her diagnosis is that Anders cannot be older than 18 years, because her wisdom teeth have not yet erupted and are more than five centimeters below the gum line. Five centimeters are approximately two inches, so what Alex obviously meant was five millimeters.