Fantastic oral history of that performance. Absolutely must read if you're at all interested in how this happened at all. www.businessinsider.com/tom-holland-...

An oral history of Tom Holland's sensational 'Lip Sync Battle' performance

The producers, choreographers, and dancers behind the "Umbrella" and "Singin' in the Rain" mashup explain how it came to be.

The fact that they got ALL that done in such a ridiculously short time span is Aldo commendable.