For better or for worse, Avengers: Age of Ultron is a movie jam-packed with characters and events. The film introduced us to the Maximoff twins, Quicksilver and Scarlet Witch, plus we got to witness the surprise revelation of Hawkeye's family. Somewhere along the way, though, we lost some of the motivation for our favorite characters. For instance, while visiting Hawkeye's hidden home, Thor suddenly decides he has to fly off and do some god stuff. This results in an awkward scene that unsuccessfully sets up Thor: Ragnarok, but it does successfully show off Chris Hemsworth's muscles. But after that, we don't really see Thor again until he dramatically crashes inside Stark Tower to bring the Vision to life. Because Thor seemingly had no way of knowing how to bring Paul Bettany's body to life or even where his friends were, many people think this is a plot hole hiding in plain sight in the middle of the movie.
Of course, Thor's weird story isn't a plot hole, but the full rundown of what happened might have a runtime that rivals Age of Ultron itself. The short answer is that Thor consulted the Norns, beings similar to the Fates, who conveniently give him advice while he takes his mid-film bath. So why don't we see any of this? Well, that's because Joss Whedon's first cut of the film would've fit right in with Middle-earth, as Age of Ultron was originally over three hours long. As you might expect, Marvel executives wanted some judicious cuts, and after audiences reacted poorly to different versions of the Norn cave scene, Marvel turned the sequence into the fragmented mess that we've got now.
But why not just get rid of it altogether? According to Whedon, Marvel insisted on having this cave scene (hey, Ragnarok isn't going to set itself up), and they threatened to take out the awesome scenes at the farm if Whedon didn't include the Norn segment. So audiences ended up with a scene that just created a whole lot of confusion instead of providing any answers. But there's also a shirtless Chris Hemsworth, which probably made the whole thing easier to watch for quite a few audience members.