The Great Spontini - May 9, 1974 - S3-E8
Audio problem: When Jamie says, "Where's your sense of humor?" her lips aren't moving, or are out of sync. (00:26:30)
8 1/2 Months - November 15, 1955 - S3-E12
Audio problem: Sam and Al are walking along the road when they come across the father of the baby. Sam tells Al that he's just a boy. Al replies that Sam is just a girl. Al's mouth appears to be saying "guy" or something else and the line is dubbed.
Nuclear Family - October 26, 1962 - S3-E21
Audio problem: Just before the dog carries in the sack of shotgun shells, Mack and Sam have an argument, and Mack's dialogue is very poorly looped. Throughout the scene, the sound is out of sync with his lip movements. (00:33:00)
Chosen answer: Per the Quantum leap page at http://www.scifi.com/quantum/episodes/season5.html. 8 August 1953: An enigmatic leap lands Sam in a Pennsylvania tavern, as his own grown self on the day of his birth. As Al and Gushie work frantically to locate him, Sam befriends a wise bartender (popular character actor McGill, who'd appeared in a different role in the very first "leap") and a group of coal miners. As a host of familiar-looking faces pass through the bar - with different identities than Sam remembers - Sam ponders his life of leaping with Al the bartender, who tells Sam he controls his own destiny. Pressed for more, Al the bartender simply shrugs and says, "Sometimes, 'that's the way it is' is the best explanation." Sam realizes he must right at least one more wrong before he can go home, and leaps back to tell Al Calvavicci's wife Beth (from "M.I.A.") to wait for Al, who will survive Vietnam and come home to her. The closing title cards state that Beth and Al have four daughters and will shortly celebrate their 39th wedding anniversary ... and that Sam Beckett never returned home.
Boobra