@18 "Also, most people want to get to their destination quickly."

Given the general level of uselessness at airports with decrepit radar and air routing systems, tsa, and the general taking forevericity of airplane travel I wonder if a blimp wouldn't actually make it to the destination faster.

I believe the warning is more for some of the initial characters they used like Piano Man. You know, the guy who would playing his piano until he messed up and started smacking his head on the keys. They were told it probably wasn't a good idea to have him. As someone who once tried to emulate the character I must agree.

There are a couple of other instances that I can't remember along with some changes in understanding how kids learn. They're listed in the Sesame Street Unpaved which I must recommend as an awesome read.