The Hostage - S9-E21
Continuity mistake: In this episode the hidden door to the "secret recipe room" is controlled by pressing the top right panel on the wall. But pressing that top panel should not open or close the door. In 9x12 "The Hot Rod," when they first discover the "ingenius" panel, it is only the panel second from the top that works, none of the other panels control the "secret" door when Ike and Miss Emily press them. (00:20:05)
The Hostage - S9-E21
Continuity mistake: After the explosion in the Recipe room, when Octavia opens the hidden door there is no molding at the top of the door in the shot from the foyer, but in the next shot from inside the "secret" room, as Octavia enters the room, there is molding along the top of that door. (00:20:45)