All of the above! The avalanche of stuff you've hidden in cupboards etc and which then rains down on you (or worse, a viewer) when you open it...
Traipsing back and forward to your car to load and unload stuff to hide (can you tell I have a lot of clutter)!
Constantly having to clear out pet cages and wash pet bedding in case it smells and you/other household members are just accustomed to it so can't tell...
The expenditure on scented candles, air freshener, fresh baked bread, fresh flowers, 'stunt pineapples' etc. to keep home in show home atmosphere and scent! See also, the sinking feeling that the purchase of all the above items is totally pointless as 90% of selling a house is probably size/location/price not how well stocked the fruitbowl is, but continuing to purchase all the stuff anyway just in case...
Time wasters who clearly have no intention of buying anywhere and just want a nosey, or are super positive, come back for multiple viewings etc then disappear never to be heard of again.
Viewers/EAs who ask for a viewing with 20 mins notice 'as they're in the area' causing you to have to run around like a mad thing cleaning/tidying/hiding embarassing items ... and then only stay 5 mins and clearly aren't interested!
Viewers who want to stay and have a 20 min chat with you at every viewing (did all my own viewings and lots of people apparently wanted to tell me their life story...)
And yy to the useless feedback e.g. "we really wanted somewhere on the first floor" (about a ground floor flat) - oh right I'll just levitate it up a floor then shall I?