SpaceX Starship Rocket Spins Wildly and Explodes

The video tutorial discusses the process of a rocket's first stage performing a flip and boost back maneuver for landing. It then covers the expected stage separation between the Starship and the Super Heavy booster. However, an unexpected situation arises as the Starship stack continues to rotate without separation, indicating a non-nominal event. The video emphasizes that everything beyond clearing the tower was additional success.

What observations were made regarding the Starship's rotation during the launch?

What does the phrase 'icing on the cake' imply about the launch process?