Right.
1.0 is the exetrmely bugged version; they rushed it for a Christmas release. 1.1 has a lot less bugs, but was still messy. 1.2 is the Greatest Hits version; still bugged.
There are loads of little things that aren't supposed to be there. The only one off the top of my head is that you can get outside of Laguna Seca and drive your car in any direction forever. It disappears for a point, but you can keep going. Great place to test top speed.