I have...

...watched the older episodes of the current season again and "found out" that this Brazilian actor had even more appearances. It's interesting to see how they include new characters.

There aren't any Austrian actors that are starting to make it in the US I think. A few Germans maybe. There are only two (?) Austrian actors who are famous around the world. Schwarzenegger and Klaus Maria Brandauer (he was a bad guy in one James Bond and acted together with Ethan Hawke in White Fang).

Do you know this Brazilian actor from local movies?

Yes you really need to start watching. Lost gets better and better. Today is an all new episode by the way. Maybe it would be a bit tough to start with watching the beginning of the third season. On the other hand I also started to watch the second season and bought the first season later. Which was a bit confusing but not that much.