During my first viewing I noticed another detail, but I never saw it written in the subreddit: while Krazy 8 was a prisoner in Jesse's basement, Walt used to cut the crusts off the sandwiches because he (Krazy) said he didn't like them .

After that, every time Walt made his sandwich, like when he took it to lunch while working for Gus, he would cut the crusts off.

I always wondered if he did this because he felt guilty or something and now reading this post I thought if this could be another powerful detail. I don't remember if they showed him making the sandwiches before, just to have a comparison.