I can't believe how much is still unchanged (e.g. subway and sidewalk etiquette, bodegas, refusal of radiators to adjust heat output)) in the past 25 years since I lived in NYC. So I snorted. Favorite was the leprechaun on the subway.
Most of these hold true for London. For the subway pole hogger, I always say "Excuse me, I need to hold onto that because I can't reach the overhead rail" (I'm 4ft 11in). It always works, because the hogger would look like a total douche/bitch if they refuse to move and leave me with nothing to hold onto on a moving train.