Proof Of Time Travel

This is a shot from the 1928 Charlie Chaplin film 'The Circus'.
I see a zebra and a window sticker for the film itself and a woman talking on her mobile phone. In 1928. A mobile phone.
Some say she is merely scratching her ear or looking at the size of her feet, it's a man dressed as woman because for whatever reason they needed a lady in that scene and there were only men on the set at that time and he is trying to hide his sideburns or adam's apple.
For me the only plausible theory is that the woman is a time traveller. Yep, that's what i'm going with.