Project Almanac: Explanation

Usually I do "full explanation" topics, here it's not possible since it's just a teen flick filled of plot-holes.

But I can explain one thing that people seem to have trouble with: The camera.

The reason why the guy disappears at the end but not the camera is because, like jessie or his friend who get confronted with themselves thus creating a paradox, destroying his time-machine creates a paradox in which, as a human being, he can't exist because the action of a human using the time-machine then destroying, erases the human.

But not the camera which is just an object. Thus, when he travels back for the last time he changes something: he leaves his own camera in the garage alongside his dad's stuff, some of which gets moved to the attic.

So several year later, they not only find the 2004 Dad camera, but also the second-loop (the one we see in the movie) analog camera.

Then there's the goof at the end: why does the second camera have them discovering the first camera since this was recorded on Christina's hand camera? Because it's a stupid movie for teens, and there's mistake OR but that's a stretch, he consolidated all the footage on an old analog cassette which I don't see him having the resources and time to do.