*Hank waves to Walt who is in the back of his SUV*
Another “full circle” thing. In Season 4 Episode 4 “Bullet Points”, Hank tells Walt about how he wants to be the one to arrest Heisenberg, then wave at him like Popeye Doyle in The French Connection. And this is exactly what he does. This is also how Walt waves “bye bye” to Hank in “Blood Money”.
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