I stumbled across this gem uploaded by “A&A Home Movies” on YouTube. It’s an incredibly in depth look (over an hour long) at classic Movie World from 1992, containing full recordings of numerous defunct attractions and shows in decent quality. (For some reason, YouTube won’t let me embed it, so here’s a link):
https://www.youtube.com/watch?v=h4S1WKrhi8E
Also found this video from “Roger Garrod” showing the park under construction in early 1991!