I like this episode a lot, even though it contains a rather big plot hole I haven’t been able to reconcile for myself (more on that in a minute).
Good bits, besides those already mentioned:
The expression on Saffron’s face when Mal lets her out of the box, and as we realize that she’s been locked in there for probably hours. 
This is part of a longer exchange with a nice payoff. Wash says, “I have a question.” Saffron says, “You’re wondering why I don’t just do this myself.” Then Wash says the line above. And then, later in the scene, Jayne says, “I have a question, why don’t you do this yourself,” and there’s an absolutely perfectly timed beat where everybody looks at Jayne, including Saffron with an utterly priceless “this guy could not be more perfectly stupid if he tried” expression. Then she says, “Good question,” and Jayne looks smug. Cracks me up.
Oh, and the thing at the end where Inara points the Lassiter at Saffron and says, “Wonder if it still works” and pulls the trigger without hesitation. Rather an interesting insight into her character, that she’d be willing to kill Saffron in cold blood. Of course, then she has a real gun, and she doesn’t shoot Saff with the weapon she knows is functional. Maybe she was only willing to kill her if the death was, y’know, ironic. 
Plus, if Saffron were to die, then we wouldn’t have the possibility of seeing her psychotic-but-eye-meltingly-hot character again. Woo mama.
Okay, here’s the plot hole:
The heist centers on the trash disposal. Mal and Saff break in, free the Lassiter, and toss it in the garbage hole, and thus into the trash bin hanging off the bottom of the floating habitat. When that happens, the disposal system is activated, and the trash bin is grabbed and flown off by the drone. The plan is to reroute the bin so they can retrieve the Lassiter at their leisure.
But here’s the thing: Isn’t that an awfully huge bin for one small piece of trash? Are we supposed to believe that every time somebody tosses something in the garbage, one of these drones comes along and takes the enormous dumpster box off to the incinerator or wherever?
Seems like if the plan is supposed to make sense, then the system needs to have been rethought a bit. There are two possibilities, I think.
The timed schedule: Every ten minutes during the day, the bin is flown off, and a new one drops in. The plan requires Serenity to hover, waiting, until they get word from Mal that he’s dropped the Lassiter. Then they have X minutes, depending on how long it’s been, to reprogram the destination.
The weight trigger: The drone is summoned whenever the trash bin accumulates a certain amount of material. The plan requires Serenity to tap the bin and then wait until it gets to 99%, and then have Mal toss in the Lassiter. Alternative, you could have a comedy scene where the bin gets to 80%, but they can’t wait any more, so Mal tosses in the Lassiter and then runs around grabbing and throwing in every other heavy object in the room.
As it is, though, the plan just doesn’t make any logical sense to me. Can anyone explain what they thought the writers were getting at?