-Ash doesn't get Pikachu from Professor Oak, he finds it in his house
-Ash has a crush on Gary's sister; Gary's sister isn't even mentioned in the TV show
-Professor Oak doesn't even KNOW Ash! He meets him on MT. Moon in "Clefairy and the Moon Stone." He is, though, still Gary's grandpa
-Professor Oak is young and rugged, a stark contrast to the Old Fart we all know and love
-We meet Bill in the same episode we meet Prof. Oak. As far as I know, there's no such thing as Seamore (yay!)
-Where's Team Rocket!? Not in the first four issues, that's for sure!
-Misty and Ash first meet on a fluke: Misty sees someone getting thundershocked, goes to check it out and starts hugging Pikachu. The whole bike thing happens about a page later.
-Ash catches a Fearow
-Brock doesn't come with Ash right after the gym badge; he appears an issue later. There's nothing on Brock's family, either
-Sabrina is a very nice psychic gym leader, not all evil and, you know, "play with me" like in the show
-Brock's known Sabrina since childhood, and is somewhat sensitive about them still being "just friends."
-Gary drives a mo-ped! ^_^
-Ash really isn't that annoying! It's almost disturbing, but it IS a good thing...
Erm... there's a lot more, but I'm too lazy to write all the little ones right now. Maybe later. Maybe... when I get more mangas I'll put some more stuff up.