Falx Cerebri - S2-E6
Corrected entry: Gemma gives Tara a .38 gun which holds 6 rounds in the chamber. She is practicing shooting at a target and fires 5 rounds. When she points the gun at Ima, the chamber still has 6 rounds in it. There should only be one round left.
Correction: I have just watched this scene. You cannot see the bullets, only the casings are visible as the view is from behind the gun. The initial response to this mistake is correct.
Correction: Revolvers don't eject shell casings automatically and are still left in the chamber, which is what we see. 5 empty shells and 1 round.