All Americans - November 6, 1962 - S2-E14
Audio problem: During the speech where Al tells Sam to quit (to force Chewie to play), Sam says he can't quit but his mouth doesn't move for a couple seconds after the words start playing.
Sea Bride - June 3, 1954 - S2-E21
Audio problem: When the little girl is dragging her sister across the room to get her to meet Sam at the pool, she says, "He's waiting at the pool for you," but her mouth doesn't even come close to mouthing those words.
Disco Inferno - April 1, 1976 - S2-E2
Audio problem: When Sam says "I'd rather be dead," his lips don't move in sync with the words. (00:01:35)
Leaping in Without a Net - November 18, 1958 - S2-E19
Audio problem: In the beginning of the show, when Sam's father tells him to get down, Sam climbs down and falls off the net. When he hits the dirt it makes a sound like he's hitting a board.
Maybe Baby - March 11, 1963 - S2-E20
Audio problem: When Sam is looking in the mirror talking to Al, he says, "Would you look at me? I've got a gold tooth." However, the reflection doesn't mouth the first part and doesn't even say the second.
Good Night, Dear Heart - November 9, 1957 - S2-E17
Audio problem: When Sam and the Sheriff are on the dock the Sheriff is talking through a shot into the next one, except his mouth isn't moving during the last seconds of his line.
Her Charm - September 26, 1973 - S2-E15
Audio problem: When the two bad guys are chasing the girl through the dark forest, one says "it's too dark," the girl screams, and the other says, "who needs light?" - but both say these without moving their lips.
M.I.A. - April 1, 1969 - S2-E22
Audio problem: When Sam, dressed as a guru, is talking to Al about Beth, Al calls the lawyer a "scuzzbag" but he mouths "scumbag." Guess it couldn't get past the censors.
Thou Shalt Not... - February 2, 1974 - S2-E7
Audio problem: At the dining room table, we hear Karen's voice say "It's all right, Uncle David." But her lips don't move. (00:14:00)
Disco Inferno - April 1, 1976 - S2-E2
Audio problem: When Chris is performing, and we see his dad watching, one of the scenes has poor audio sync. The music is ahead of his singing.
A Portrait for Troian - February 7, 1971 - S2-E11
Audio problem: Near the beginning in the tomb, a woman says "he's been dead for three years." Her mouth doesn't match what she is saying.
Animal Frat - October 19, 1967 - S2-E12
Audio problem: A dog runs by Sam chasing one of the frat pledges. It's barking according to the audio, however the dog does not bark.
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