Several characters make reference to the discovered finger bone, mistakenly calling it a "phalangey". The plural of finger bones is indeed "phalanges" but the singular form of the word is "phalanx".
Grace's reaction to Henry's picnic 1st date is not logical. Upon learning of the time shift, Grace's biggest concern was that "her" Henry was gone. THIS Henry's idea of creating the exact first date that GRACE's Henry created proves beyond a shadow of a doubt that her Henry and this Henry are the same..