I have taken a handful of backstage tours and information like this is often part of the tour. One such tour (Keys to the Kingdom at WDW) took us to an area where we got to see some of the wigs that characters like Cinderella wear. We also saw a couple characters in the utilidors (backstage) without their heads on and a Chip costume that was not being used.Originally Posted by RenMan
So, there is nothing to "blow the whistle" at. These tours are for guests 16 and up and are designed to show inner workings of the park.
BTW: the characters we saw that were headless were Eyeore and Tigger. When they saw us they (intentionally) put one EACH OTHER'S head. Then they put on a little show for us.