Venice: please no. No, no, no, no, no. One tile rivers with no real basis are anything but aesthetically pleasing. Venice could use a walls + castle in 600 AD scenario though. Make it a bit more difficult, though I have no problem with the HRE taking it.
East Russia: Sure, but move the gold 1W or the gems 1E to allow one city to cover all of the resources.
East Coast America: Do not mess with what works. The one tile made coast near Quebec is good, no Montreal. AI settles Washington, the moving of New York and Boston chokes it, and New York is in the right spot already with Boston shoved 1N or 1NE so that they are not neighbors. Also human taking Philadelphia as their capital is much nicer than New York.
Mexico: Was good how it was before. Better to have a passage through Central America too early than never.
Libya/Sardinia: Yes, except towns outside cultural borders are ugly, in my opinion.
Japan/Taiwan: I don't think so, except for fish near Taiwan.
Palestine: Sure, whatever. Unworkable towns on plains/hills look extremely awkward.
Greenland/Iceland: Sure, but get rid of towns. Won't make anybody settle it except for Viking UHV if you eliminate some coast. Best city there is 1NW of the fort, so it should be encouraged.
UK/Denmark: Good, I'll keep settling Aberdeen and be mad about the unreachable crab.
Caribbean: Right on. Having lived there for some time I must agree.
Bangladesh: and nobody will settle Pataliputra. No.
Southwest US: Arizona is anything but a floodplain state. More of a desert with cereal and seafood industries. No changes needed.
Alaska: pretty. Move the new oil either 1E or 1S for only needing two cities (a third would need to go on the oil to reach it).