I’m no expert on this, but in addition to the other factors people mentioned, I would say that people in Japan seem to pay a lot more attention to high school sports. The Koshien Stadium and the high school baseball tournaments name after it are very famous. I’m not even interested in sports, but I know about them and often notice friends talking about them online. I know absolutely nothing about the college baseball tournaments or where they’re held.
Yes, although the season 1 Rita was taken directly from the Japanese version of the show and dubbed over by an American voice actor who is still alive (but likely retired).