Short version: a woman (man?) appearing in behind-the-scenes footage of Charlie Chaplin's "The Circus" appears to be talking on a mobile phone. Details in the video below.
Even if the person is a time-traveler, they aren't talking on a mobile phone since it's unlikely there were time-traveling cell towers in 1932. Most likely it's some sort of satellite phone or radio communicator a la Star Trek. Anyway, very strange. Some people have suggested that it could be a hearing aid, but it sure doesn't look like one, and why is she speaking into it to herself?
it's more plausible that it's a 2-way radio, but 1932 is a little bit early even for a walkie-talkie.
Unlikely to be a 2-way radio. The transistor was not invented until the late 30s early 40s. Thus, all electronics then was tube based -- very large, very heavy.
It certainly does look like a mobile phone. I can't read lips well enough, however, to try and figure out what he/she might be saying.
Very interesting.
As I think about this a bit more, he's looking at a DVD. What is on the original film stock? Could this be a well crafted easter egg?