I'll start.
Did you know that Wil "Wesley Crusher" Wheaton's first credited acting role was Martin on the Secret of NIMH animated film? That was probably the last time he sounded assertive and tough in an acting role too, and he was both a little kid and a mouse. :rat-salute:
Oh wow I hadn’t heard that one! Did you know that the reason they barely show the shark in Jaws is that the animatronics sucked?
That shark almost killed George Lucas when he was touring the set