All Happy Families Are Alike - S1-E22
Revealing mistake: When Falcone is attacked with a bazooka, notice how none of the chickens in the cages move a single muscle with the explosion right next to them.
Revealing mistake: The chest of the "dead" girl on the autopsy table moves due to her breathing, and her eyelids move twice. (00:15:20)
Answer: Tabitha got her hand sewn back on, Butch didn't.