Question: Early on, Odin is shown telling very young Thor and Loki about the great Frost Giant battle held in Scandinavia, presumably before they were born. Yet the children's book and Erik's own childhood memories indicate that adult Thor and Loki were part of the legends that come from that region, and by implication, would date to that time (965 AD?). Is Thor old enough to remember visiting Earth hundreds of years ago, or not?
Question: In the scene after the end credits, you see Professor Selvig and Nick Fury in a corridor and Nick fury shows him "the Cube". Then in a reflection, you see Loki. Are we to presume Loki made his way back to earth and took on Professor Selvig's appearance or he just appeared out of nowhere and found "the Cube".
Question: Presumably the only people on Asgard that are worthy of wielding Mjolnir are Thor and Odin. Why isn't Frigga worthy? And since Loki isn't worthy, shouldn't that have tipped off Odin that his son wasn't exactly noble, or would he just pass it off as Loki not being worthy because he is mischievous?