Blade Runner Convention Reel (1982)
https://www.youtube.com/watch?v=1ZVW8Zn5fSM&list=PLYn2a0e2FVIJ66EP8vMU64l-kIhHU9zg7&index=8&t - from the FUTURENOIR1982 YouTube channel (13 mins long).

The blurb:
“One of the Blade Runner Convention Reels featuring interviews with Ridley Scott, Syd Mead and Douglas Trumbull about making Blade Runner universe. This 16 mm featurette, made by M. K. Productions in 1982, is specifically designed to circulate through the country’s various horror, fantasy and science fiction conventions.”

On the Set of Blade Runner - 1982 Featurette
https://www.youtube.com/watch?v=EUg5xnTdxHo - from the 6stringsmonk YouTube channel (14 mins long).

Video also includes the Convention Reel and 6 minutes of silent BTS footage.