User blog comment:Fire Eater/Differences between the manga and the anime?/@comment-1037137-20180714074602/@comment-1327106-20180715004921

Lots more than usual. I haven't watched it yet so I don't know all the specifics, but they're condensing a lot of the early chapters of the Uprising arc to get to the action faster. The kidnapping of decoy Eren and Historia, Erwin getting arrested, and Levi meeting Kenny happen at roughly the same time. It's apparently a very fast-paced episode.

Keiji also escapes his manga death since he's with the Eren and Historia when Kenny shows up, so he doesn't die at the same time as Nifa and Goggles.

The changes are likely because Uprising arc isn't very Titan-focused until the very end with the Founding Titan reveal and Rod's Titan attack on Orvud, so they're trying to rush the story through the political stuff and get back to the Titan-fighting where the studio can show off its animation skills.