The ballroom set was insane. It covered 12,000 square feet. The floor was a giant mirror, polished to a high shine.
The chandeliers? They held 2,000 fake candles. Each one was a tiny LED light. But they had a real crystal drop that weighed 1,000 pounds.
Emma Watson and Dan Stevens rehearsed the waltz for weeks. They did it on a moving platform to simulate the sweeping camera. No CGI for their feet—just pure, human effort. And a little bit of magic.