I think the rule used to be that the player had to be completely past the defender for offside.
And I think the rule was changed to "any part" of the player needs to be past the defender. That's why we're seeing so many more close offside calls.
Iran looks to be MLS quality.
US has to keep up the pressure, like they're still tied. At this point, if US ties or loses it will be a serious disappointment.