When they're playing gin, Duvall is playing with 8 cards, not 7.
When Marie is talking with her therapist, she talks about having just gone to see Zombieland. Given that the scene takes place in 2008 and Zombieland wasn't released in the US until October 2009, this simply is not possible.
Elias the intern asks how why they don't need another DNA sample from the other brother.
Det. Duvall then 'reminds' him that Y-STR's are identical with siblings.
He'd previously said that he had studied genetics when the detectives were discussing it several episodes before, demonstrating that he understood the subject perfectly. This was obviously a device to explain this to the audience, but they perhaps should have had another character ask the question so it could have been answered and still remain plausible.
He'd previously said that he had studied genetics when the detectives were discussing it several episodes before, demonstrating that he understood the subject perfectly. This was obviously a device to explain this to the audience, but they perhaps should have had another character ask the question so it could have been answered and still remain plausible.