1. Urinals in the Women's RestroomIn Japan, some women's bathrooms have a small urinal. This is intended to be used by young boys (accompanied by their mother).
Urinals in women's washrooms have scared many a female traveler into thinking she has walked into the men's room.
2. Puke sinksIn Japan, some izakaya and bars have special sinks for vomiting.
3. Open concept men's washroomsMen's washrooms (particularly the outdoor variety) are sometimes open concept (no walls). The logic is that nobody has any interest in peeping in to the men's washroom.
4. Small toiletsIn Japan, some public restrooms have one very small toilet. It's for kids.
5. Vending MachinesYou can buy virtually anything from a vending machine in Japan. There's often a vending machine in public restrooms.
(Sanitary napkins, adult diapers and nylons for sale at a women's restroom at Meiji Shrine)
6. Toilet EngrishSigns in public restrooms in Japan are often filled with charming Engrish.
(Naive Lady Toilet Paper)
In addition to engrish, many Japanese toilet signs are a little mysterious or excessively cute.
7. Electronic ToiletsElectronic Japanese toilets often have odd features.