I've found some more footage of Spielberg discussing his 'pre-visualization' phase of storyboarding on 'Raiders of the Lost Ark' for British TV. Plus an old Q&A from the Cinema Dome in 2013 where he discusses the footage that follows- Harrison Ford dismissing his storyboards on the set!
Following that is some 'Jurassic Park' boards then some good footage of Spielberg evolving his process from boarding to CG pre-viz on 'War of the Worlds'.