I had the exact same reaction when I watched it the first time. When they were like, "We're not gonna pay last year's reeeeennnnnnt!"
I was like, "Okay. Then get the fuck out of Benny's property."
Also, the line "RENT RENT RENT RENT RENT" makes me laugh so hard. It's...silly.
And speaking of the building, when they break back in, Joanne tells them that once they are inside, they are squatters, so Benny can't kick them out or call the police.
They are still trespassing on private property, and he can still have them arrested or at least kicked out. (Again, handled much better in the stage version)