A Kenner internal promotional sales video from 1983 is a fantastic look at how the company rallied its salesmen and employees prior to the release of Return of the Jedi.
The video features an announcer that gets a bit too excited about the upcoming film and toys. It also features clips from the Jedi trailer that provided the only look at the film prior to release.
Check it out here.
After seeing that I want to go buy some action figures.