τοῦτ᾽ ἐκεῖνο, 241d, 252c

τοῦτ᾽ ἐκεῖνο, I do not understand what it means and whether there is a difference between the two. I cannot find it in dictionaries.

It’s a colloquialism. Occurs quite a few times in Aristophanes. “That’s it!” (Lit. This is that.)