Visible crew/equipment: After Tobias burns his hand in the kitchen on the Cornballer, he asks Maeby where she is "off to this glorious afternoon?". She responds, "I'm going to audition for a play." In the first few frames of this response, you can see the shotgun mic at the top of the frame. (00:03:20)
Continuity mistake: In the scene where the four siblings are at the model home discussing their mother, Linday's coat keeps changing position on the sofa.
Continuity mistake: When Tobias is directing the play, he slams his folder down on the floor just in front of his chair. A few seconds later the folder has moved and is now facing in a different direction and is several feet away from the chair.
Continuity mistake: When Tobias meets with the school principal, the number of bites taken from the principal's sandwich changes between shots.
Continuity mistake: At the rehearsal for the play, when Steve Holt is called up to the stage to play Beatrice, his jacket disappears between shots without him having time to take it off.
Chosen answer: "The One Where They Build a House," S2E2.