Every once in a while, the Office does something so stupid and unrealistic that I can't suspend my disbelief enough to find it even entertaining. Last night was one of those times. There is NO WAY that anyone other than Michael, and maybe Dwight, would've stayed later than 5:00 just because Jo was there. Nor would she have expected them to. That whole storyline just bugged the living crap out of me.
Beyond that, the episode wasn't even funny, other than mega-desk. I know that I remarked in a comment on another episode that I want the Office to go back to putting the show in the office, but last night kind of made me regret that thought. Darryl's promotion might be a fun thing though.