I don't think that was overly technical.
At the end of the game, the US was fouled and got to kick a free kick. A free kick is taken at the spot of the foul, which in this case happened to be right next to the goal.
The free kick was good. It should have been 3-2 right then. The asshole official called offsides. In soccer, no player can be behind the two closest opposing players to the goal (the goalie and the defender) until after the ball is kicked, or it's offsides. They showed replay after replay and it was as clear as day that no such foul occurred. Not even close. The point was removed.
On TOP OF THAT, the Slovenian player clearly committed a foul inside the box, which means it would be a penalty kick. This means they get a free kick right in front of the goal. The Slovenian player completely picked the US guy up in a bear hug. Not at all legal.
It should have been 3-2 with the US getting another free kick right in front of the goal.