Catch A Falling Star - May 21, 1979 - S2-E10
Continuity mistake: As Sam is preparing to go on stage as Don Quixote, after catching the lead actor, a quick cut to Dulcinea dancing is shown. It is supposed to be Sam's love interest and ex piano teacher Nicole as Dulcinea. However, you can see Nicole standing in the background, in the pink outfit she was wearing in scenes from the beginning of the episode. (00:41:55)
Her Charm - September 26, 1973 - S2-E15
Continuity mistake: After throwing the laundry bags out the back of the truck, close up shots on Sam and the girl show the back of the truck being relatively empty. However, the next shot from the rear of the truck has the back full of laundry bags again.
M.I.A. - April 1, 1969 - S2-E22
Continuity mistake: In the beginning, when dressed in drag, Sam has a cigarette with a long bit of ash on it. He looks at his "reflection" and there is a short bit of ash on the cigarette, then it cuts back to him and there is a short bit of ash.
All Americans - November 6, 1962 - S2-E14
Continuity mistake: When Sam and Ruben are fighting in the locker room they knock over a set of lockers (and only one set) and the door flies open on it. When they roll over the set of lockers the camera cuts and 2 sets of lockers are suddenly knocked down with all locker doors closed.
All Americans - November 6, 1962 - S2-E14
Continuity mistake: In the fight between Sam and Ruben in the locker room, Ruben has a white visor in his hands during the fight which magically disappears during the fight after a camera cut, and Ruben leaves after the coach breaks up the fight, without the visor.
All Americans - November 6, 1962 - S2-E14
Continuity mistake: Chewie is wearing the number 86 jersey in both games. However, when he is sitting out with his supposedly injured knee we see a shot of the number 86 jersey chasing an opponent.
Leaping in Without a Net - November 18, 1958 - S2-E19
Continuity mistake: When Sam and his sister are on the trapeze and she does a double and he catches her you can see that the bar she jumped from is not moving behind her. Then when she jumps back to it, it's swinging again.
All Americans - November 6, 1962 - S2-E14
Continuity mistake: In the party after the 1st game when Chewie and Sam are talking about the championship, Chewie pulls up a chair and sits on it backwards with his hands in his lap. After the cut to another camera, his arms are up on the back of the chair.
Maybe Baby - March 11, 1963 - S2-E20
Continuity mistake: At one point when the police are chasing Sam, the car has a Sheriff's star on the driver's side door; however, when Sam drives into Clayton, no star is to be seen.
All Americans - November 6, 1962 - S2-E14
Continuity mistake: In one play during the montage sequence of the championship game, the quarterback for the Jaguars (Sam) is number 15 - but he wears 12 throughout the rest of the show. This is Sam, because Al later tells him to quit, so he's been playing the whole game.
Maybe Baby - March 11, 1963 - S2-E20
Continuity mistake: When Sam is talking to Al in the store (while looking at car seats), Al checks on Margaret Dalton and holds the handset at chest level. The shot switches to Sam down on his knees and it's at his face level (about Al's waist). Then the shot switches back to Al and the handset is again chest high.
Good Night, Dear Heart - November 9, 1957 - S2-E17
Continuity mistake: At the end, when Sam is at the graveside, snow is falling and a close-up shot shows Sam covered in snow, but the wide angle shot shows little to no snow on him.
Her Charm - September 26, 1973 - S2-E15
Continuity mistake: The FBI agent's car is riddled with bullets in the opening scene. A few shots later, the same car rounds a corner during the chase, and all the bullet holes have disappeared. (00:03:30)
Her Charm - September 26, 1973 - S2-E15
Continuity mistake: After the bad guys attack the laundry truck and the girl starts throwing bags out of the truck, one sees in the close up shot a bullet-ridden gray door, but in the wide angle shot it's a pristine brown door.
M.I.A. - April 1, 1969 - S2-E22
Continuity mistake: Near the beginning, when Sam is undressing and Al is telling him who he leaped into, in one shot Sam is taking off his beaded necklace and in the next his necklace is off and he's taking off his belt, but Al continues the sentence so no time passed during the cut.
Sea Bride - June 3, 1954 - S2-E21
Continuity mistake: At the end when Sam punches out the bad guy, there is not a white piece of trash stuck to the back of his left shoulder. Two shots later, there is a white piece of trash there.
Leaping in Without a Net - November 18, 1958 - S2-E19
Continuity mistake: In practice, when Sam's sister tries to do the triple and he misses her, the wide angle shot shows that she is already below Sam's arms when she reaches out. But when it cuts to a close shot, she is able to almost catch his arms.
Leaping in Without a Net - November 18, 1958 - S2-E19
Continuity mistake: Throughout the show, the big top changes from one with many blue stripes on the ceiling, to one with a couple of blue stripes and a dark center, and back again.
Pool Hall Blues - September 4, 1954 - S2-E18
Continuity mistake: After the bad guy tries to hit the granddaughter with the pool cue, Sam grabs it. In the wide angle shot it shows Sam's left hand about 6-8 inches from the middle (where the dark wood inlay is), but in the next close-up shot, his hand is only about 2 inches from the middle.
Disco Inferno - April 1, 1976 - S2-E2
Continuity mistake: Sam is buttoning up his shirt while at the bar. His hands are about halfway down his shirt. Cut and we see him from another angle. His hands are now down.
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