Does soccer in other countries have less rules than in the U.S.?
FIFA sets the rules basically for all Confederations and continents.
football does not have rules, it has the laws of the game. and these laws are governed by FIFA individual laws such as extra time and substitutions are set by the competition organizers
The laws of the game are the same. Things such as video review are allowed under FIFA guidelines, but they are not required. It is only a couple years since it was allowed and not all leagues have implemented it. If the referee didn't see the incident on the field, then it's highly possible it wasn't punished because that league didn't have video review. That doesn't mean the player can't be suspended after the league reviews the video after the game. It just means there is no in-game action against him.
Eye poker would had been sent off in England
I don't think so.
it probably depends on where they are