Factual error: When George starts time traveling in his lab, we see the sun and moon cross his field of view. But then we see stars circling Polaris in the same area. Polaris is nowhere near the path of the sun.
Factual error: In 1917, James Filby has driven and parked in the wrong direction in front of Filby's Department Store. (00:33:08)
Chosen answer: It is specifically not stated which three books he took with him, leaving it open to audience speculation.
Mobrien316