The only bug I discovered that hasn't been mentioned already is a problem with the engine sound when playing online. After a couple of laps (on Fuji/Suzuka, and all other circuits I presume), a kind of chorus-effect seems to be applied over the engine sound, and remains until the end of the race. I've noticed it using the Spoon S200 thing, and also the Ferrari F430, and a couple of other cars. Practically I can't check all 70-something cars, obviously. Perhaps some other people can look out for it, specifically while using the Spoon car, as that's when I've noticed it the most.