During his apology to Bill and Catherine in his office, Dave hides under his desk, prompting Catherine to call for him. Behind them you can clearly see Dave's office door is wide open. The scene cuts to directly outside the office where Beth is fiddling with some paper. Behind her DAve's office door is shut.
For a couple seconds you can partially see the boom mic hanging center top, in the dinner scene where Mr. James is showing Dave's his open heart surgery photos.