The big deal "no-no" that is reputed to put a CGT into a non-recoverable spin is lifting off the gas in a highly side-loaded corner.
Total BS
My old '74 IROC 911/RS was a real pussy-cat as far as 911-lore lift-throttle over-steer. Of course it was a full-tilt race car, lift-gas over-steer was very mild, and one could drive it like a dirt-track car (something one would never attempt in a normal 911 of those days). The Carrera GT is even milder in response.
How do I know?
Well, I made a few driving errors, during which I felt certain would turn out to be very expensive, but turned out to be pretty sweet (Nick's voice in the back of my head was very wrong).
Even the traction control worked so much better on the track that I could have expected. The car doesn't have stability control, but the traction control worked wonders on many occasions.
My favorite traction control reaction is on the exit to turn 12 (or is it 13?) that leads down-hill to the "chute" under the pedestrian bridge. The apex to the corner is just before the crest of a hill and powering out leads one over the crest while still cornering pretty hard. As one flies over the crest of the hill under ever more throttle, the back end gets a bit light. My old IROC car used to light up the rear wheels if I wasn't careful and the back would step out a foot or so before the catapult effect had subsided.
Over the same section, at an even higher speed, the Carrera GT merely flashed the traction control light and the engine seemed to stumble for an instant. That's all. The car never, ever gave any hint that the back tires were about to step out at all.
Wonderful beyond words
Here's the yellow shark about to inhale another instructor car: