When Penny wants to roll the dice to determine how her first attack goes, Howard claims the Dungeon Master is supposed to roll. If that were the case, Sheldon would have no need for the new set of dice he opens as they're starting earlier. In fact it is usual for players to roll their own attack rolls in roleplaying games.
When Lucy makes her comment about sweat coming out of her head, her mouth is slightly open. In the next shot it is completely closed.
When Penny pours her first drink, she smiles sarcastically at Sheldon. It then cuts to a different angle of her face and she is not smiling.
Amy assaulted a TSA agent, she'd be in jail and not on her way to Vegas or home playing D&D.