In my brief exposure to the entertainment industry when I worked at the Carrier Dome @ SU the most interesting thing was what we were REQUIRED to put in the dressing rooms for the talent. Some were just a few requested items. Some were page long of things that were required under contract.
Many times they were certain brands of booze or soda because that brand was sponsoring the tour. Mostly they were certain types of food, drinks, towels, etc. We usually set them up in the home team dressing room which was right behind the stage an closest to the airlock where the trucks/vans came in.
I remember someone had to have a bowl of ALL GREEN M&Ms. We had to run out and buy about 6 bags and just sort through them by hand.
For the Grateful Dead the band had one dressing room with normal stuff in it. Jerry had the other dressing room all for himself with this requirement:
1 4x4 Folding table
1 Lamp
1 folding chair
A lot of times, those bizarre dressing room requests had an underlying purpose. For example, Van Halen would request a bowl of M&Ms minus one color (brown). So if the band showed up and there were brown M&Ms in the bowl, it would be a tipoff that the contract was not read very carefully and there might be other more important requirements that were ignored as well.