Attack on titan chapter 79: possible flaw? In Shingeki No Kyojin's latest chapter (chapter 79), beast titan throws a stone like he is playing baseball. But the story takes place in a time when baseball wasn't even known. These are the pictures:




Is this a flaw or a problem in the Japanese to English conversion? (Maybe the author did not intend baseball).

Or could it mean that Reiner, Bertolt, Annie and the beast titan are from a different time-line? (I don't think it's possible. If that's the case, they could have just used nuclear bombs instead of titans).
It is heavily implied, that world where events are set is our world in distant future. Remember castle Utgard? There was tuna cans with English writings only Ymir could understand.
It is just residents inside of walls being ignorant of possible past knowledge, possibly due to memory manipulation.