So in this episode when he's talking to some bad guys about killing off those 8 prisoners, Walt keeps staring at a painting. And when he proceeds to talk, he says "Where do you think these come from? I've seen these before." The painting was first seen by Walt in Season 2 episode 3 in the hospital where he's taken to after he's found in a supermarket naked following his disappearance when Tuco kidnaps Walt and Jessie.
GLIDING o'er all, through all,
Through Nature, Time, and Space,
As a ship on the waters advancing,
The voyage of the soul--not life alone,
Death, many deaths I'll sing.
So in this episode when he's talking to some bad guys about killing off those 8 prisoners, Walt keeps staring at a painting. And when he proceeds to talk, he says "Where do you think these come from? I've seen these before." The painting was first seen by Walt in Season 2 episode 3 in the hospital where he's taken to after he's found in a supermarket naked following his disappearance when Tuco kidnaps Walt and Jessie.