It's telling about Rick and Morty as characters and how capable they are and aren't. We got to see a lot of Morty being evil and terrible on top of what we already knew of Evil Morty. As for Rick, a running theme we saw was how willing he is to just go with what's happening around him, on top of thinking he's the smartest man in the room. Rick generally underestimates Morty, but he also has a capacity for respect towards him. More naive Ricks want to take care of Morty too as we see before Cop Rick learns his lessons and becomes a hardboiled sort of cop.
There's a lot of negativity associated with Morty's character and a major amount of detachment with Rick's character. We know this, obviously, but seeing it take all of its different forms with the various infinite Ricks and Morty's is a lot of fun and definitely something worth chewing on for the week.
Also, Morty got that mermaid puss.