Yeah, the whole thing with that though, is if you are an older member (as in your 20s or older), you probably have the old VHS versions of these movies. I do. I know that I've seen some of those gags done.
Some of the teens of this community may have the DVD versions of the movies, therefore, might not be able to catch it.
I know what I saw and heard
EDIT: okay, trying to find some decent sites. This one is for the Lion King.
http://www.animatedbuzz.com/WB/36.html and after you see and read the text, scroll down to the bottom, there are other ones about the Little Mermaid and The Rescuers and so forth.
As it mentions in all of the text, they are apparent from the old version of the VHS tapes.