Here you can post all the weird things you know about the very first Generation. This is limited to Red/Blue and Yellow.
Bug was super effective against Poison types.
Wrap prohibited any attacks from being used, making a combination of Thunder Wave and Wrap deadly. This is why Erika's Gym was very frustrating xD
It IS possible to catch Mew, using the Mew Glitch. It is a very awesome glitch, which I have used myself.
There is no Mew under the truck, I have tried it myself.
if you don't paralyse or freeze the legendary birds, your Pokéballs will miss. The second it actually hits the Pokémon, it means you will catch it.
In Pokémon Yellow, PIkachu is the only Pokémon that says it's name.
In Red/Blue, Pikachu's sprite is FAT. REALLY FAT, no joke, it's absolutely huge xD