In the last episode, Jesse didn't exactly ace his task when he went beyond simply dissolving the body of the corpse in his RV, but also dissolved his bathtub and his floor, which resulted in him and Walt having to clean up lots of intestines an extraordinarily appetizing scene. The other thing that's still left to do is the disposal of Krazy-8, the surviving drug dealer that now involuntarily dwells in the cellar of Jesse's house. And that's the part our protagonist Walt has been assigned for.
Max Arciniega plays Krazy-8, or as he's actually named, Domingo, and although this man isn't a well-known actor, he's actually a great addition to the small cast Breaking Bad has at this point. Sadly and with spoilers ahead he isn't there anymore after this episode. And with this, I did find some flaws: we've observed that Walt and Jesse were able to hear it when Domingo was only remotely coughing in the cellar down below, but in Vince Gilligan's mind, this process functions unidirectional, as Domingo appears to haven't heard anything the other two were talking upstairs. And if he did, then he would've been aware of Walt searching the trash can for the plate shards and also that Walt didn't find one piece as he audibly uttered "Y u do dis" a couple of times. And Walt discovering that Domingo does plan to kill him through the help of a trash can was a really cheap and unbelievable trick already. But there are positive aspects about this story part as well, for example the long conversation between those two.
In general though, I consider "And the Bag's in the River" to be significantly worse than the first two episodes of the series. Reason for that is that you discover how important the writing is for this show for the first time. And what I mean with that is that once the screenplay isn't flawless, the overall picture deteriorates as well. The episode is still very good simply due to the great story and the fact that most parts of Mr. Gilligan's screenplay are excellent, yet a fall-off in quality is obvious in my opinion.