Espn insider had a really insightful article on the game, the adjustments made, what worked and did not, and does touch on the officiating aspect at the end. It's paywalled, and I apparently can't copy the link to here. I have access thru my espn+ sub to watch soccer.
Upshot on Refs is that they have a demonstrated tendency to "let them play" in playoffs and teams take advantage of that with more aggressive individual tactics but...there is also a pattern for the refs to start throwing flags late because it becomes too much by late in these bigger games. If teams were smart enough, they could tone down taking liberties late in games to avoid exceeding the referees limits. Easy to say, hard to consciously do I'm sure.