SP FX: Special Effects - The Empire Strikes Back:
https://www.youtube.com/watch?v=VsgTd-1ZYuw&t - from the SystemJinx YouTube channel (49 mins long)
The blurb:
“Hosted by Mark Hamill. Originally aired on CBS on September 22, 1980. The special was written by Richard Schickel and directed by Robert Guenette, who had both previously worked on the 1977 special The Making of Star Wars…as told by C-3PO & R2-D2”