In Season 4 Episode 2 “Thirty-Eight Snub” Walt and Mike meet in a bar and they both order drinks. Walt takes his neat, while Mike takes his on the rocks. The episode after Walt kills Mike (Season 5 Episode 8 “Gliding Over All”), Hank offers Walt a drink and he requests it on the rocks.
Walt clearly adopted this characteristic from Mike after killing him, but why is he now shown ordering a drink neat? It seems Walt returns for a brief moment after his call with his son to order the drink, but then Heisenberg takes over after seeing Elliott and Gretchen on TV.
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