Okay! I played through the game as thoroughly as I can.
Here's my save file:
Not sure how long that link will actually work. If you can't access the file, let me know and I'll use a different site.
A few notes on things I missed:
Tattle Crystal King
Maybe tattle some Magikoopas
Maybe tattle M. Bush and Hurt Plant(although I'm pretty sure I got them)
A single recipe(any way to find out which one?)
Maybe a trumpet plant(do they even save?)
All untattlable enemies(example: Final Bowser, Albino Dino)
All unreachable flags(example: coins and stuff on debug maps)
Edit: I think I missed Chan, Lee, and maybe some Bloopers as well.
Played on US, though I don't know which version number(if there are multiple versions). I didn't use any hacks or cheats. I did use a lot of speedup though :p
Of course, I doubt that I got everything. The game's pretty big, so obviously I've missed some stuff, even beyond what I've mentioned. We'll have to wait for more people to pitch in.
Hope this helps!