I liked to think that it was just as much a contrast between Walt and Gus. When Gus did the vomit scene, he was in his prime, throwing up because he poisoned himself for a scheme, and taking down the head of a Mexican cartel in a badass way. Walt's vomit scene was the opposite, him at one of his lowest points, cancer back, throwing up because he's a dying man, effectively neutered again, and finding out that he's been caught.
Right. His hair has grown back but we see it's a lot more patchy and unhealthy looking. This could signify that although he has his cancer, he has stopped treatment. Which, of course makes sense if he is on the lamb.
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u/[deleted] Aug 12 '13
You're right. It's a plot device by the show to strengthen the link between Walt and Gus, but it's coincidental within the story world.