Back to the Future Part II (1989)

Continuity mistake: When Marty is going over the lake on the hover board, at the start his shoes go right under the water, but if you look at his shoes in the next shot, they are dry.

Continuity mistake: Right at the start of the movie where Doc Brown pulls up on the drive of Marty's house, we see a panning shot as Marty and Jennifer walk to the DeLorean - there are no vehicles parked on that side of the street. A moment later as Marty waves his hand in front of the Doc's glasses, there's a green VW bus parked almost outside the house. Then as the Doc's looking through the rubbish bin, the VW's moved further down the street. Then as the DeLorean backs off the drive, there's a yellow VW bus there instead. (00:01:20 - 00:02:05)

Continuity mistake: 1955-Jen is showing some dresses to a friend when Biff shows up. Watch the man passing by the girls. He walks by twice.

Continuity mistake: Inside the tunnel, Biff punches Marty who's on the hoverboard, launching him back. A shot later Marty is suddenly standing tall and next to Biff, and gets punched again.

Continuity mistake: When 1955-Marty reads Doc's 1885 letter next to the Western Union car, his right hand is either on the lower part of the paper or the upper, depending on the shot.

Sacha

Continuity mistake: When Doc travels to 1885, Marty stands on the road holding a rope and says "He's gone." When the angle changes, the length of the rope sticking out is much shorter.

Sacha

Continuity mistake: When 1985-Jen encounters her old self, 2015-Jen walks several steps further. When the angle changes, old-Jen has stepped back 4 meters to allow for both to stare at each other closely.

Sacha

Continuity mistake: When 2015-Jen takes the pizza out of the oven, the amount of green peppers decreases between shots.

Sacha

Continuity mistake: When Jen finds out that she got married in the chapel of love, her hair swaps from perfectly brushed to totally messed-up between shots.

Sacha

Continuity mistake: After Jen is taken to her home in the future, Marty and Doc are in the car. Doc places his left hand over his glasses, but when the shot changes he's got his pinky finger raised.

Sacha

Continuity mistake: When Marty reads the paper with the news about his son's arrest, the way he holds the paper differs between shots.

Sacha

Continuity mistake: At the beginning of the movie when Doc smashes through the trash cans, his glasses are not on. In the shot where he steps out of the car they are.

Continuity mistake: During the beginning of the chase sequence, Marty is hanging on to a rope and there is a rear facing shot looking at him. There are two wet tire tracks in the shot. These disappear in the following shots.

manthabeat

Continuity mistake: At the start of the movie Biff is waxing George's car in the driveway with his truck parked next to it. However it completely disappears and isn't seen again even though Doc appears and parks where Biff's truck was, and Biff doesn't leave the premises.

Continuity mistake: Marty's new truck in the garage at the end of Back the the Future I and beginning of Back to the Future II has different front license plates.

Continuity mistake: When Marty is on Strickland's porch with the shotgun pointed at him, his hands go from in the air to down by his waist in a split second.

Continuity mistake: Int the courtyard chase scene when Griff and gang crash through the courthouse windows, the sun's position changes in every shot.

Continuity mistake: When Strickland is hitting Biff with the Almanac in the parking lot, the way the book is folded changes between shots.

Continuity mistake: When Marty confronts Biff in the alternate 1985 in the hot tub, the girls change positions. The blonde was on his left and the brunette was on his right. When they see Marty and scream, they move forward but there is no way they can switch that fast. (00:55:40)