So I picked a random race and I get this one guy. We end up playing Delfino Square, but there was no indication that it was mirror, and I barely lost because I made the wrong turn in the beginning and the other guy got a big lead.

Still, I didn't know that mirror mode was in online. Any way to know before the race that you're going to play on mirror?

--GCII

before the race, on players screen (that screen that shows all players and scores of them) you already can see what will be next race, just check the bottom of the screen.

And when the course appear, on top shows again whats your playing.

Moritz