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.
Catch A Falling Star - May 21, 1979 - S2-E10
Continuity mistake: When Sam is going on stage near the beginning, another guy peels off his moustache and says "imposter." The problem is, the makeup lady already removed his moustache earlier in the episode.
Good Morning, Peoria - September 9, 1959 - S2-E6
Factual error: While it's done for furthering the plot, climbing a live AM radio tower would result in RF burns and would possibly be fatal. The man who cuts the transmission cable would be in a lot of pain or dead doing that in real life.
What Price Gloria? - October 16, 1961 - S2-E4
Revealing mistake: When Sam is getting ready with the other woman, the shoes on the floor do not match in the reflection. Their position is off.
What Price Gloria? - October 16, 1961 - S2-E4
Revealing mistake: Sam and the other woman are staring at their reflections while Sam is getting ready. Notice where the woman with darker hair is standing in relation to Sam. Their mirror images are further apart. The woman with darker hair also has her head tilted to the right slightly. Her mirror image doesn't.
Disco Inferno - April 1, 1976 - S2-E2
Factual error: The episode takes place April 1, 1976, and Sam performs a stunt for the "Earthquake" movie featuring Charlton Heston, but Earthquake was released in 1974, so was filmed long before 1976.
Honeymoon Express - April 27, 1960 - S2-E1
Factual error: The date is April 27, 1960, and Al says the Francis Powers U-2 spy plane will be shot down in two days, namely April 29, but the plane was actually shot down on May 1, 1960, four days after the episode.
Freedom - November 22, 1970 - S2-E16
Continuity mistake: Sam is talking to Al in the desert about what year it is. Al's cigar jumps in his mouth and back to his hand.
A Portrait for Troian - February 7, 1971 - S2-E11
Revealing mistake: When the recovered drowning victims are lying on the ground, Troian's supposedly dead husband moves his feet. (00:39:25)
Another Mother - September 30, 1981 - S2-E13
Visible crew/equipment: After going to get pizza, Sam and the kids return home. As they pull in the driveway a long boom mike is visible in the back car window.
Jimmy - October 14, 1964 - S2-E8
Continuity mistake: Near the end of the episode Michael Madsen's character attempts to run over Sam with a forklift, causing the boy to fall into the water and almost drown. As the boy is falling into the water, there is a wide shot of the action. In the scene, a box is being pushed over the edge into the harbor. In the close shot following, the box is gone, as are other items nearby.
The Americanization of Machiko - August 4, 1953 - S2-E3
Revealing mistake: When Sam is first looking at his reflection of himself in the glass at the beginning of the episode, the items behind his reflection do not match his point of view. A man walks through the shot and never leaves the frame, however is gone when the shot flips back to Sam.
Her Charm - September 26, 1973 - S2-E15
Continuity mistake: The rearview mirror on Nick's car disappears and reappears repeatedly, when he pursues the laundry truck and later at the cabin.
Her Charm - September 26, 1973 - S2-E15
Revealing mistake: At Boston's FBI, Al's reflection is visible repeatedly, such as on the fire extinguisher's chrome surface in the hallway and on the elevator while Sam talks about the cabin.
Another Mother - September 30, 1981 - S2-E13
Continuity mistake: When Sam uses martial arts against the men from the van, one of them pulls a knife as he kneels on his right knee in the close-up, but next shot he is kneeling on his left knee.
Another Mother - September 30, 1981 - S2-E13
Continuity mistake: When one of the sicko men from the van pulls a knife on Sam, the white blouse is either tucked into the skirt or hangs over it, depending on the shot.
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.
Maybe Baby - March 11, 1963 - S2-E20
Factual error: Across the street from the general store where Sam and Bunny escape is an AllState Insurance office. The logo for the store is the more modern 1990s logo. The 1960s AllState logo had a different appearance.
Pool Hall Blues - September 4, 1954 - S2-E18
Factual error: After Eddie tells his helper to get rid of Sam's/Charlie's pool cue Alberta, we see an exterior street shot with an elevated subway going by, with a lot of 1970s and 1980s cars parked and driving by. Not quite appropriate for the 1954 setting. (00:35:40)
Good Night, Dear Heart - November 9, 1957 - S2-E17
Revealing mistake: When Sam is talking to the sheriff in the parlor and says it can't be prosecuted, he walks in front of a mirror and we see the real doctor in the mirror, except we see the real doctor standing up just as he becomes visible, and Sam's shoulder just to the left. They used the mirror's angle to fake the mirror image, and probably panned the camera over the other actor's head as it swung around which is why he had to stand up. (00:38:40)
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