O.K., the first one may be easy. When I was about five, I was at my grandparent’s house and saw a black and white movie where a tights and leotard wearing invisible woman was walking up a staircase. Then the tights I think fell away and it was just a leotard walking up the steps. It freaked me out so bad. I “think” it may have been an ABBOTT & COSTELLO movie but am not sure.
The second one is very vague and I don’t expect an answer but I vaguely recall some kids had a box and in the box was a face or a head that could talk and I think its name was Chico. I could have that all wrong but that’s what I seem to recall. Wondering if it was the INVASION OF THE BODY SNATCHERS from the ‘70s… The Chico name really seems to stick with me though.