Okay, I found it.
Version 1.0:
1. Car wash says 5000 cr. but actually costs 50 credits.
2. When you race Tahiti Maze against the Peugeot 206 it drives into a wall, gets stuck, and sits there the entire race while you buzz way ahead.
3. The Muscle car races are incorrectly labeled (I forget how...it has something to do with the license requirement I think).
4. 98.2% possible at best instead of 100% when you finish the game. This is due to the fact that GT2 was originally supposed to have drag racing, but this got dropped due to time constraints. PD never fixed the total game percentage until several months later.
5. Numerous typos; the most famous being when you enter the first race in the GT300 it says "Grand Valley Bast" instead of Grand Valley East.
6. Max Speed/Garage Bug. If you do Max Speed testing at the Test Track and save your game, it's very possible some very weird 🤬 will start to happen with your game over time. The records (where you've got your Top Speeds saved) get all screwy and won't make any sense. Cars may vanish from your garage. It's also possible for "mystery cars" to suddenly show up in the garage. These mystery cars will be called NO NAME instead of Toyota or Nissan or whatever. They may have very weird sound effects. They may also be transperant. All sorts of weird stuff. But the WORST thing about this bug is it
can make all the cars in your garage vanish.
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Version 1.1
1. Car wash still not fixed (I think).
2. Tahiti Maze fixed. The Peugeot completes the entire course.
3. I forget about the muscle car part but I'm pretty sure they fixed it.
4. total percentage still at 98.2%
5. Some typos fixed (including the one listed above at GT300). But they never got
all the typos!
6. Garage Bug still not addressed (according to people who owned version 1.1).
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Version 1.2 aka Greatest Hits
Everything listed above has been addressed and fixed except a few miscellaneous typos and odd glitches, like two cars that rub fenders with one another can wind up "melting" into one another for a few seconds (true). The Max Speed/Garage bug is also supposed to be fixed. 100% game percentage possible.