Tell me about it. I don't remember the computer being THIS aggressive! And (I'll post it on Twitter when I get home) there was one race where I tied for first. They still counted it as second place!
I'm just glad I got the regular edition and not the $60 version. They didn't make it clear what the bonus stuff would be. It's almost all unlockable.
I checked the eShop pages for both editions earlier this week and the more expensive version has a list of what extras it has, including asterisks for the few things that are unlockable in the cheaper version, but unlocked right away in the more expensive version. The majority of the list was exclusive to the more expensive version, but most of that was non-essential fluff.