So, I've been watching all of DBZ again, because I recently purchased all 9 seasons on DVD, and I've noticed a couple of interesting things. So far the most interesting, is what King Kai said about Saiyans when Goku first arrived on his planet. King Kai was explaining that Planet Vegeta has the same gravity as his his planet and that that gives them an advantage., Bnd then he said, "But that's not the root of their power. Saiyans are born with a natural ability to fight anywhere, it's like a sixth sense, it's in their blood."
I find that line to be very interesting, and I think it's just further proof that Saiyans can breath in space. Another thing that I found interesting was when Goku met Princess Snake, he ate a ton of drugged food and he shrugged it off easily. I think that's proof that higher power levels give a resistance to poisons.
Also, Yajirobe just bit Krillin's ass. ^_^