With reference to the throttle quadrant cover, I once saw an Air Eng wrestle one into place after shutdown (and making a fair struggle of it) before leaving the flight deck happily chatting to the Captain. I let them get to the bottom of the crew steps before suggesting that it for aesthetic and noise abatement reasons it might be a good idea to also shut down the No. 1 engine which was still happily chuntering away in ground idle.
There were definitely days when I felt I was reading the checks purely for my own amusement...