I'm amazed I've not seen this thread before and have little to add:

i) McDonalds USA - will they please export the Breakfast Burrito to the rest of planet Earth.

ii) McDonalds Suva (Fiji) "We don't serve the Quarter Pounder" (apparently they have to import all of their beef).

iii) McDonalds in Warsaw. Unbelievably inexpensive by McDonalds standards. Also, interesting to watch tea obsessed Poles dunking McTeabags.

iv) McDonalds in Akihabara (Tokyo). I didn't notice any real differences here other than to observe that the only FAT Japanese person I'd seen all day was eating in a McDonalds.

v) McDonalds in North Sweden or lack thereof (the last branch closed because the locals preferred Max).