Yee it's only one scene but is vary short , Eric only intrudecude the band him self I think on L.A concert
I do remember seeing Eric. It a scene backstage at I think the Club Whisky. He does have a line. Don't remember exact words, but he tells the Doors something about cooling it with the reefer smoking. Also you can see him again in a crowd scene (no lines) he's stage center front looking directly at camera.