This theory on Walt taking out Skyler is pretty crazy. Given that someone mentioned Jesse's jacket this fits.
http://www.buzzfeed.com/lukelewis/this-breaking-bad-theory-is-pretty-mindblowing?s=mobile
Shit, that's pretty crazy. Although, Walt never saw Fring put down a towel for his knees to puke, although I did make that connection while watching the episode. And Jesse's jacket, it would be more emblematic if it was Jesse's actual jacket, but the similarity is close enough to suit it's purpose.
However, this makes me think, that after all these years, all the costumes Bryan Cranston has been dressing up in from other characters in the show are the ones he ends up killing?
When he grabbed the ricin cigarette, the first thing I thought of was that it was meant for him. He already has that giant gun in his car, which seems to be meant for an explosive confrontation. Why have the ricin if you seemingly mean to open with a bang? That's a stealthy kill, it must be meant for him. So his Comic Con appearance as himself may be a nod to his character's suicide.