The Revengers on the Bifrost Bridge
One of the more memorable shots in the first trailer depicts the four main heroes -- the "Revengers" -- standing together on the Bifrost Bridge, ready to battle Hela. After that unforgettable moment, we were excited to see how that showdown would unfold. However, in the final film, there's no showdown featuring the foursome, and our heroes never line up neatly across the Bifrost like they do in the promotional footage.
Thor, Valkyrie and Loki are there, but Hulk is a little preoccupied fighting Fenris, the giant wolf brought back to life by Hela. Another big difference is that during this particular moment in the siege of Asgard, there are shiploads of Asgardians fleeing their ruined city.
While it might have been awesome to see Hela face off against all four protagonists, the changes made to this scene don't change the plot much. It appears as though there would have been a huge battle on Bifrost between Thor and Hela, and Asgard would have been on the brink of destruction.
The Eyes Have It
You might also have noticed that, in the trailer, Thor has both his eyes, which isn't the cast at this point in the film, as Hela had already cleaved one out of its socket. This was an intentional edit to avoid robbing the audience of a shocking moment.
These scenes were enough to get us excited for Thor: Ragnarok, but the final product isn't any less spectacular because of their absence. In fact, it's clear enough these edits might have made the film better, especially with regard to the end sequence, which is where most of the changes were made.
Waititi has a rather unorthodox style, but he certainly knew what he was doing. Each character seem to develop organically, the plot has a flow, and the jokes are (for the most part) hits, which is pretty impressive, considering a lot of the film was reportedly improvised.
Opening Friday nationwide, director Taika Waititi's Thor: Ragnarok stars Chris Hemsworth as Thor, Mark Ruffalo as Hulk, Tessa Thompson as Valkyrie, Tom Hiddleston as Loki, Cate Blanchett as Hela, Jeff Goldblum as The Grandmaster, Idris Elba as Heimdall, Anthony Hopkins as Odin, and Karl Urban as Skurge.