Extremely fuckin' lame!
The characters were unable to find out who committed the crimes and why, so the writers just put it out plain for the sake of being the last episode. Terrible ending and terrible writing!
-How do you think it feels, Fat Morty...?
-I thought I was Left-Handed Morty.
-Then you should use your left hand to eat more vegetables.
Beth: Sorry Jerry, you're real.
Jerry: [crying] I'm a parasite!
Beth: Yeah... but you're real.
You can run, but you can't hide, bitch!
Guard: Someone call his wife and children!
Child Morty Jr.: They're not robots, Rick!
