I don't have the video or the time to list the penalty incident in detail but it involved VAR, a penalty given by the referee, the ball on the spot with Buffon poised and ready to make a save and the player lined up ready to take it, but it was then given as a free kick to the defending side after a strange period as described above with the player ready to strike the penalty.
There were some mentions on Twitter about the Juve players forcing/pushing the ref to consult VAR, and what reversed the decision, whether it was a foul or offside.