Very interesting, but I think saying it is a time traveller is jumping to a bit of a conclusion. I am thinking if people from our time really were travelling back in time that they would be a little more careful about walking out in public talking on a cell phone. More likely is that it is something stupid like her cheek was itching, maybe it was sore because she just left a dentist, maybe she was thinking to herself and holding her hand up to her head to help think (yes, most of us do this), or many more believable ideas. I am sure that we could probably look at many other old movies and find weird instances that we can apply to being modern time. This is just an unexplainable couple seconds, not a time traveller. But if time travelling is real then I want my future me to read this and come back and give me the powerball numbers for next week!