Hey wait a second,where was Olivia when all of this was going on?
The irony is that Olivia never officially met Snuffy (I don't think she was in episode 2096), but there's a later clip where she interacts with Alice and Uncle Wally...and Snuffy is right next to them! Some continuity issues there, I suppose. I think Alaina started doing the 227 show in Los Angeles around this time, but don't quote me on that.
It's very true that the adults were pretty mean to Big Bird about "his imaginary friend," especially by the late '70s. Bob, David, Olivia, Maria, and Mr. Hooper were the worst ones from what I've seen. Susan, Gordon, and Luis didn't seem so bad about it, though. I loved seeing David and Bob, both at a loss for words when Snuffy was finally revealed. Shame that Mr. Hooper never met Snuffy...how would he have reacted?