I know, I usually have a lot more to blab about right after the episode finishes.
Spoiler: Apparently they chopped a part out from episode 20 that was in the VN, Nae was suppose to kill Moeka, and shes the one who kills Okabe in the future, apparently she time traveled back into her child body or something. I'm actually pretty happy they left that part out of the anime.
Oh yeah; 21 preview, seems pretty safe to watch, can't detect any possible spoilers like in the last preview video.