Continuity mistake: Season 2, Episode 19: "Today Is The Day, Part 2" - When Queeg tells Jesse to secure all side arms and plasma rifles, take Officer Goodnow's body to the cool room and return to duty, he walks halfway up the metal staircase behind him twice.
Visible crew/equipment: When John gets back from seeing Riley's body, he sits down at the kitchen table in front of Sarah. Sarah tells him he shouldn't have gone. John then says, "It was a risk, I know". As he says this, the shadow of a boom mic can be seen on the wall behind him.