From the Dan Curtis interview:
We had ourselves a hand puppet and another puppet that had a rod stuck up its ass and was held up above the floor. The floor of the set was held up by risers. We cut lines into the floor that were covered by the carpet and we had some idiot underneath running with this thing that moved [the puppet's] arms up and down and its legs. It was pathetic. [Laughs.] It was the worst-looking thing I had ever seen.
I would hate to be a SPFX guy who did work for Dan and later be referred to as "an idiot."
While I generally have a lot of respect for Dan, there are times that I marvel at the sheer cluelessness he is wont to exhibit. And I'm not referring specifically to the "idiot" remark, not by a long shot. This interview is representative of so many that he does, where real achievements by a lot of people he was associated with are glossed over or dismissed out of hand. He probably doesn't intend to be interpreted that way, but if I'd gotten to where he is, I think I might show a considerable amount of respect toward anyone who helped me get there, whether their contribution was large or small.