Board Thread:Game Discussion/@comment-27155796-20151103175218/@comment-26715739-20151103185941

Looks like a bug someone had during NASCAR - which meant they could save/reload and get repeat payouts on the series % completion bonuses. Don't think they ever posted an update, but maybe they're still farming the gold...

@ME7: I assume by "free" they mean free as in "liberated" not "free" as in "beer" - ie didn't have to unlock - see all the "NEW" flags (you could never get that without a bug because you'd need to have raced at least some of those races to unlock the last stage).