In his recent memoir, Saved By The Bell producer Peter Engel admitted that “Jessie’s Song,” an episode that was widely ridiculed for its dramatic portrayal of caffeine pill usage, was actually supposed to take on a much darker subject and serve as a jumping-off point for tackling more serious teenage issues on the show. A first draft of the episode was recently uncovered. INT. JESSIE’S ROOM – NIGHT JESSIE SPANO is passed out on top of her fully-made bed, when ZACK MORRIS enters dressed to nines for the girls’ performance that night. He’s flabbergasted to see Jessie is sleeping! ZACK Jessie Hey Jessie,…