Time Traveler Views
One thing slaps me in the face, as obvious in the 'time traveler' photo... why does everyone but him have reflection of their glasses? Notice the glasses do not have a reflection. I also noticed he is the only one with any markings, such as moles,etc. With the values of that time, everyone dressed up...except him, who is also not clean-shaven. Now with what is presented to me, what my knowledge of the 1940's was, I'm thinking it is a fake. Any determined and well thought person can fake something.... after all, when you work in TV and radio, it makes the thought and possibility more likely. That's what we do, within our jobs.
I haven't read the other comments so some may have said this already. The photo legitimacy is highly probable. The texture of his clothing denotes natural fibers which is normal for that era. Though it might be a camera, I'm inclined to think he's holding a hat or helmet. The hair's swept appearance hints at headwear. His welder style glasses give the impression that he rides a motorcycle or a roadster. No one in the group seems to be looking at him peculiarly. Let's face it, anyone wearing more modern clothing would've been noticed by someone in the crowd. Also, there's no sign of Photoshop being used. NOTE: everyone is assuming time travelers are white men by default.
I just noticed another thing, if you look at the front of all of the faces, you wi8ll see light scatter or light relfection from a light surface that's in front of them. Time traveler does not have that. I do not notice any light reflection, lightening of the front of his face as with the others. This goes along with my theory of not having a reflection on his glasses. I also cannot help but to notice that everyone around him is looking more to the left, than what he is. I also notice that he is too tall, where more light can reach him, but the light is not as contrasted, or as harsh on him, as the other taller man and people around him.
Mark Twain's A Connecticut Yankee in King Arthur's Court (1889), in which the protagonist finds himself in the time of King Arthur after a fight in which he is hit with a sledge hammer, was another early time travel story which helped bring the concept to a wide audience, and was also one of the first stories to show history being changed by the time traveler's actions.