Mike and Walt spend a good part of the episode saying exactly what they mean, which in this genre counts as a plot twist. For reasons the episode never fully explains, the barrel keeps coming up. The episode leans on reruns of earlier moments, which is nostalgic the first time and less so the fourth. There is a new face, Quail, who walks in like they already know how this ends. Write down "I'd like to come by tonight and see them."; it will matter more than it seems. One of the reasons people stay up too late.