Many of the 'combat action' displayed in cutscenes (and at one point watching the young Jedi train), including a moment with Luke Skywalker, are not pre-determined and are done somewhat more randomly via the AIs. What this means is that no two cutscenes are alike... and even though you may have seen it before, it will probably happen differently the next time. This is notable because sometimes unintentionally humorous and anti-climatic results occur (aka the AI doing something stupid).
My explanation excludes the pre-rendered video files (usually of spaceships and exterior views) used within the game.
Built with the ID software Q3: Team Arena engine.
Billy Dee Williams, who played Lando Calrissian in the Star Wars movies, did the voice for Lando in Jedi Knight II.