User blog comment:Fire Eater/Differences between the manga and the anime?/@comment-1327106-20180628050428/@comment-24407809-20180628052013

Eren being unable to transform in Stohess was also anime original. In the manga, he has trouble transforming once, but then transforms just fine after a second try the anime added in him being crushed in the tunnel (and a bunch of scenes of Armin, Mikasa and Jean fighting Annie in the meantime).

There's also a scene in between the Fall of Shiganshina arc and the 104th arc where Eren gets beat up by MPs for harassing them (or something along those lines).

There's an entire anime-only sequence in Trost where Jean's gear breaks and Annie, Connie, and Marco have to defend him while he gets new gear from a soldier's corpse.

The flashback of Historia and Ymir trying to save Daz during a training exercise adds in a bunch of anime-only scenes of Eren insisting that the 104th needs to go to search for them.

There's an anime-only flashback in season 2 that shows Eren defending Armin from bullies, and Hannes getting drunk and getting into a fistfight with a civilian who asks him to break up the fight.