To go along with the "sewage" running through the streets in MK, the costumes fit the part too. There are some areas of Liberty Square that represent more upscale neighborhoods than others. The female CM in those sections have dresses that go all the way to the ground. The female CM in the "poorer" sections have shorter skirts. This is because the poor women would have to trudge through the sewage on the streets and didn't want to get their dresses dirty.
The requirements to be Tinkerbell in Wishes are very specific. I can't remember them, but you have to be within maybe a 3 inch height span and fit a small window of weight. You can be male or female. And the amount of time it takes Tink to fly varies with the weather.
You can also pick up the phone in Tomorrowland under the TTA to hear something.
There are in bathrooms in Liberty Square to keep with the time period. There is a bathroom in the rear of the Columbia Harbour House, but technically that is across the border into the next land.
In Liberty Square, the shutters are hung at weird angles. They look like they're sagging. That's because during the Revolutionary War, England stopped shipping things here (obviously) and we needed all the metal we could use for bullets. So people took the hinges out of shutters and hung them with leather straps instead.
