Disney released its first teaser for the upcoming live-action movie "Mulan" on Sunday. The remake is based on the animated version from 1998. The live-action version, directed by Niki Caro, is set to hit theaters in March 2020. Chinese actress Liu Yifei will play the title role, and Jet Li will star as the emperor of China. Netizens are looking forward to seeing it, but they have also spotted a major mistake…