*Slightly spoilery talk for Episode 17 of Re:Zero*
I know Subaru is basically being driven insane with all of his deaths and everything that happens to him, but the whole time he's trying to talk to Emilia, I'm just saying "Tell her about the cultists, tell her about the cultists, tell her about the cultists, TELL HER ABOUT THE CULTISTS...Or just grab her and tell her she's useless. Sure. That works." Also his inability to connect the loss of Rem to the magically flying whale is frustrating too. When faced with multiple instances of people being erased from existence because of the whale, he can't put it together.
Probably being far too harsh and looking at this as an outsider who has the convenience of piecing it together, but it seems pretty obvious with the caravan driver disappearing, Otto not remembering Rem, and Ram also not remembering her. With that, he should've been wondering "why", rather than just simply lashing out, like it's their fault. I'm pretty sure they would just have that be the result of his sanity slipping way, but I personally hate frustrating stuff like that. That kind of stuff just drives me nuts lol I don't care if it might make sense in the story, I want it to stop and for them to realize what is going on lol