It turns out during the most controversial ending in Oscars history, there was a watch that happened to be right in the middle of all of it and was on the wrist of Warren Beatty tucked up his sleeve!
Warren Beatty was wearing a Cartier Santos on his wrist during the mix up over who won the Best Picture Award. He was wearing a Santos on leather strap recognizable by its sapphire cabochon in the crown and its rectangular screwed bezel.

Warren Beatty wearing a Cartier Santos. Picture (C) EPA/AARON POOLE / AMPAS
A close up of the watch with the sapphire cabochon and rectangular bezel visible.

Closeup of the Carter Santos on the wrist of Warren Beatty.
A watch spot that could have gone unnoticed!