I forgot most of the details in GI (I only remember the general direction of the story) and when I watched the episode I didn't get the impression. It wasn't until my second viewing that I remembered, "hey weren't Hisoka's fingers supposed to be broken?" and just chalked it up to one of the things MH skipped.
I heard those sounds, but it didn't occur to me broken fingers, more like over-contraction of the muscle or whatever that shows exertion of effort. "Clearly see each hand", first it happened too fast for it to register. Second, it could have just been yet again a portrayal of the effort exerted, not necessarily that the fingers were broken.
If you already read the manga and remember the details, I understand why you would say those are "clues" that point to Hisoka's fingers being broken. But as someone who has forgotten the details/new viewers, this wasn't conclusive.
His fingers did break.
(Credit to SHINOBI-03 for the gif from http://mangahelpers.com/forum/showthread.php/78732-HxH-MadHouse-Anime-Discussion!-(Use-Spoilers-for-safety…)/page117)