These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fridge Logic: Why didn't Darth Vader sense Han in the closet when he strangled Greelanx? Or assuming he did, why let him go?
Wild Mass Guess: He probably did sense him, and let Han go to bear witness to what happened to traitors. After all, if he didn't have someone listening there was little reason to bother with the charade of acting like Greelanx had betrayed the Empire, when in fact he'd been ordered to lose (the Hutt bride was just unrelated icing on the cake).
"Funny Aneurysm" Moment: Han makes many smuggling friends, especially in The Hutt Gambit. Of all these friends only Chewie, Roa, Shug and Salla don't end up betraying him later.
Nightmare Fuel: Han overhearing Greelanx getting Force-choked by Vader for accepting a bribe and throwing the battle of Nar Shaddaa.