The bugs in this post must be able to be duplicated by other users to appear in this list. If PD keeps an eye on these forums, this might be a handy resource for them to have a summary of problems that users experience which decrease enjoyment of the game.
In cockpit view, the on-screen driver drives with one hand in certain gears in manually geared cars (example: Porsche Carrera GT). Link
When upshifting a manually geared car, the throttle gets blipped (very short throttle spike), which creates a weird and unnatural upshift sound. Link