I do not know how many people know of it, but I figured out how to get that stupid Dog in the Underwater Shinra reactor out of the way. When you are doing the submarine mission, lose when you are in the sub. Get the crap blown out of ya. Once that is done you can go back down to the reactor. And the dog will be gone. This obviously opens up a new path which leads to a Red Shinra Submarine. Oh there is one catch. From what I remember you miss out on Bahamut ZERO because you failed to defeat the Submarine carrying it.

Cool, but i like all bahamuts. So i'm not gonna miss on that one.

I like Bahumut ZERO too, but I'd have to try this out just to see what it's like. I always loved making new discoveries in FF's.

Also, when I was in the elavator when you infiltrate the Shinra Building to rescue Aerith, sometimes when you stop the elevator, I found out a Shinra manager will try to get on rather than another battle, and he says "Oh my god! Sorry I wasn't trying to get on. Ahhh!", he'll freak out knowing Avalanche is there and start running scared out of his boots. I never knew that could happen and it happened to me last night and was very humorous!

yeah that has happened to me as well. Twas kinda cool. It has only happened twice for me.

i found this out, but preferred the Bahamut materia! :)