Unlike modern "natural" game, Mystery was mechanical. The archive shows him running "The Nerd" routine or "Jealousy" routine. He literally memorized stories (called "stacks") to say to women for three hours straight. Watching the archive is like watching a Broadway actor rehearse lines.
While once sold as high-priced DVD sets, much of the archive has shifted to online platforms: Mystery - Tell Stories To Get The Girl mystery method video archive