SPOILER WARNING: Not sure what chapter it happens in so i can't define the spoiler, if your up to date on the chapters then your good :P.
I've only read up to chapter 95 so far but i've noticed one kinda interesting thing, which was kinda reinforced now that i know there is another gantz in germany (or so i've read on this forum, can't be sure my self havn't read that far yet).
Gantz dosn't speak in that stupid leet speak that the scanulators used for most (if not all) of the chapters, it actualy speaks with backward letters acourding to direct translations of the scripts. Now to what it was i found interesting. Gantz's name alone is the interesting thing, if you look at it as gantz its self spelling its name with backward letters then it would read Gants in correct manner, "gants" meaning more then one or a part of a group of somthing, and since i now know that there infact is atleast one more gantz in the world it kinda makes sence in a way.
Just thought i'd post my thoughts on this, and if someone's already posted a thread on this then im sorry, but i couldn't find anything on it.