Corrected entry: When the family is meeting in the Board Room at the office, a boom mic is visible for a few seconds then is pulled out of camera view.
Corrected entry: When everyone is in the conference room talking about who might be a spy there is a boom mic visible at the top of the screen.
Correction: Completely intentional as part of the joke. The conversation in the boardroom includes a discussion about whether or not the room is bugged and if people could be listening, at which point there is silence and a boom mic is seen in shot. It is not a mistake within the show due to the documentary-esque fashion it is filmed in, which occasionally leads to jokes about such elements as camera crews and the self-aware narrating style.
Correction: This is an intentional part of the joke. It is just after they say there "may be a listening device in the room."