The red bird involves talking to a certain NPC within Central Park 3 times.
Viewing post in Pent's Wacky, Zany Road Trip to Adulthood comments
ive beaten the game and the secret ending some time ago already, honestly I don't like how random the cloud is. I thought one NPC saying that the skyscrapers scraped the clouds meant that the evil cloud was in thirdville. Other than that the game is pretty bad for a ferociter game, but i couldn't care enough to actually give an in-depth explanation.