That is pretty mind-boggling, Dave. I can just barely see how Pamela Opal Lee Archer Murphy could've ended up in the Zero Hour episode-it deals with an event in the San Fernando Valley in the late nineties, it's just barely possible that she witnessed some part of the incident or knew some of the people who did, and facilitated the producers getting in touch with them, so they gave her a cameo as a thank you. (I've seen pictures of her dating from the 00s; she was still a very photogenic woman, but obviously frail, and some people claim that she wasn't all that lucid in the last years of her life). But that's a longshot all by itself and you add to that the idea of her playing a recurring grownup villain in a children's scifi series (10 episodes 25 min each) shot in Tasmania (Australia) in the 1979-1981 timeframe...well, again, it's not absolutely impossible, but it is awfully improbable.
I will try to check youtube at some point to see if I can find clips from either tv production. Pamela Archer Murphy was pretty distinctive-looking, and I would be surprising if this other (probably Aussie or Canadian) Pamela Archer looked at all similar.
I don't have a user account at IMDB, but maybe someone who does can point this set of errors out to them. I don't hold out a lot of hold for them fixing it, given the Willard Willingham entry:http://www.imdb.com/name/nm0932248/board/
In 2004, people were pointing out that the Willard Willingham of Universal Studios had a different birthdate and was still alive, and yet IMDB still lists him with a wrong birthdate and a 1997 deathdate, which would come as a surprise to Boyd Magers and Dr. William Russo, who seem to have had some dealings with him in regards to their Murph books (published in the 00s and referencing him as still alive).