Erm it's a behind the scenes of a movie. Why the **** would a time-traveller be walking across a movie set? I bet she has something to her head, and is talking to herself laughing about something that happened. Such as hitting her head, then holding an ice-pack up to her head, laughing about what had just happened.
You know, a plausable explanation? Like this is just stupid

Like he made a video with some idiotic explanation, and he watched it for a year, as if he's onto some big discovery.

Like how stupid can people be? At what point did he not think, "wait. that's literally impossible. I bet she hit her head, and is laughing it off. Next movie".
Like seriously

I hate nerds
