Thanks for the bug report! I'm having a little trouble reproducing this. What was your heroic mount and driving style for your first playthrough? And did you use the back button or the Rewind link to start your second playthrough?
In my first playthrough my heroic mount was the robot and my driving style was a secret third thing. I also fired rockets that playthrough.
I believe I used the rewind link to start the second playthrough. I only hit the back button when I noticed the error and wanted to confirm I hadn't missed an added bit of dialogue about getting back in my car or something.
Hope that helps!