Oscar the WTF?!?

Once again, I'm probably the last to know about this but, in the off chance that I'm not, I thought I'd share. Oscar the grouch was originally yellow. Yes, yellow. Then, after the first episode of Sesame Street, he was suddenly orange. Only in Season 2 did he turn green. WTF? Why have I never heard this before? It takes some schmuck on a comment board to alert me to this fact? Where were all of you? Sheesh. If it weren't for the internet, I wouldn't know anything.