I guess I can look past a couple errors as long as they don't affect gameplay too much, but it bugs me that there are errors in the cars' specs at all. PD is a big company, they make lots of money for Sony and have a large budget, and they pride themselves on accuracy... they should not be making these kinds of simple mistakes. I mean, are they just making up numbers because they ran out of time to actually look up accurate figures? Did they decide to make the Turbo heavier than in reality for gameplay reasons? Are they using an inaccurate source? I don't know why they use inaccurate information, but it's kind of annoying and it detracts from the overall fit and finish of the game.
Obviously there are other flaws in the game that bother me a whole lot more than a few tiny inconsistencies in car specs, but it seems to me that if they can't get these specs right, what else could be wrong? And it's not like it's that much data to take care of. Figuring out how to make each car behave as much like the real-life version of the same car is a lot harder than inputting the correct number in a field somewhere. The weight is one number per car - not that much when you're a major game studio with a large budget and lots of people whose job it is to research these cars and make sure everything's right.
You wouldn't be happy if you went to a restaurant and they got your order wrong, would you? Maybe the restaurant was busy and the cooks were overwhelmed. An understandable error, but that doesn't mean you'll necessarily put up with being served the wrong food. After all, it's their job to get it right. It's the same with games.