Well, really it's throughout the video, but esp. from the start to 0:08 as you're downshifting for La Source. What I'm hearing is this:
Under acceleration, the pitch of the transmission is off, far too high and screamy, where the real car is more mechanical. Under deceleration, the transmission does all kinds of strange things, sounds like an alien spaceship, no pun intended. It spools strangely, almost as if it's turbo when I know the transmission is not...turbo chargers have a distinctive spool flutter, that's in the stock Kunos sound. Again, listen very carefully to the onboard I provided from Macau...all kinds of speeds are travelled in that car for the best example...the real car transmission is less complex than 1.4 update.