Because of the time travel aspect, many episodes allude to famous people or incidents indirectly, such as Sam suggesting to young Donald Trump that New York real estate would be valuable in the future, suggesting the lyrics of "Peggy Sue" to a teenaged Buddy Holly, showing young Michael Jackson his signature moonwalk dance for the first time, giving Dr. Henry Heimlich the idea for his namesake maneuver by saving him from choking, and setting in place actions that lead to the discovery of the Watergate scandal.
When Sam recovers from a quantum leap, he finds his memories to be incomplete, particularly with the knowledge about himself and the project; Al would later refer to this as his "Swiss-cheesed memory"; while Sam appears to others (with the exception of animals, young children, and "abnormal" people) and himself in a mirror as another person (which in the first episode, when he finds himself in the past as a supersonic-jet test-pilot, Sam initially attributes to his partial amnesia).
The main premise for Quantum Leap was inspired by such movies as Heaven Can Wait, and Here Comes Mr. Jordan. Series creator Donald P. Bellisario saw its concept as a way of developing an original anthology series, as anthologies were unpopular with the networks.
Quantum Leap is an American television series that originally aired on NBC for five seasons, from March 1989 through May 1993. Created by Donald P. Bellisario, it starred Scott Bakula as Dr. Sam Beckett, a physicist who leaps through spacetime following his quantum experiment in time travel, by temporarily taking places of other people's lives in order to correct historical mistakes. Dean Stockwell co-stars as Admiral Al Calavicci, Sam's womanizing, cigar-smoking companion and best friend, who appears to him as a hologram.