Celebrating 40 Years of Empire: Behind the Scenes
https://www.youtube.com/watch?v=yix_9g_Ob74&t - from the official Star Wars YouTube channel (7 mins long).

The blurb:
“See never-before-seen on-set footage and outtakes from Star Wars: The Empire Strikes Back, with commentary by members of the cast and crew who brought the first Star Wars sequel to life. Featured are rare behind-the-scenes moments captured by the film’s documentary crew, including the frozen exteriors of Hoth, the Rebel base hangar, interiors of the Millennium Falcon, Cloud City, and the film’s climactic duel between Darth Vader and Luke Skywalker. Also included is an all-new and archival audio commentary by George Lucas, Mark Hamill, Anthony Daniels, Billy Dee Williams, and Lawrence Kasdan.”

Celebrating 40 Years of Empire: The Legacy
https://www.youtube.com/watch?v=9ua2v64mh9o&t - from the official Star Wars YouTube channel (5:30 mins long).

The blurb:
“The talent and production crews keeping the Star Wars legacy alive today look back at Star Wars: The Empire Strikes Back to share their thoughts and memories of the film that transformed the Star Wars story into a saga. This brief featurette includes humorous outtakes and behind-the-scenes footage, with all-new commentary by Kathleen Kennedy, Dave Filoni, Bryce Dallas Howard, Pedro Pascal, Deborah Chow, Leslye Headland, Taika Waititi, and Diego Luna.”