Continuity mistake: After the bug in the cake kills the cops, it runs to free Boris. The amount of strawberry cake on the sewer lid changes between shots. (00:03:25)
Continuity mistake: In the scene where J and O are talking about the temporal rifts (just before they are alerted to the invasion of Earth) the ring on O's left hand keeps disappearing and reappearing. (00:29:45)
Continuity mistake: When K takes the prize out of the Crackers box, the size of the box magically becomes very tiny. (01:07:55)
Continuity mistake: When Jeff sets the box with the time device in it on the counter, he begins to open it with one hand on the side of the box, and the other hand on the front of the box. It cuts to a close up and suddenly his hands are both on the sides of the box. (00:33:05)
Continuity mistake: When the racist cops are frisking J, one pulls out J's gun and questions him about it. In the reverse angles, the cop is holding the gun over J's shoulder with almost all the handle in his hand. In the shots showing J's face, the cop is holding the handle so that some of it is sticking down, and it is in front of J's shoulder. (00:41:00)
Continuity mistake: This movie starts in 2012 as shown on Zed's memorial, then travels back to 1969, 43 years earlier. But J tells the young K "25 years from now you're going to recruit me, and 14 years after that, the guy you didn't let me kill today..." That's only 39 years. (00:47:55)
Continuity mistake: When J falls off the green car by The Factory, cardboard boxes, a woman and a sailor magically appear out of nowhere. (01:01:40)
Continuity mistake: When Boris blows the prison door and encounters hundreds of guards, the damage on the door changes between shots. (00:04:50)
Continuity mistake: When the alien cuts Boris' shackles, chains and shield, their position on the floor changes between shots. (00:03:35)
Continuity mistake: When J lands back in time, the people behind him walking inside the building are not continuous between shots. (00:37:05)
Continuity mistake: When K grabs the remote to lift the library wall, the remote is facing a 9 o'clock direction, but in the close-up it's facing a 6-7 o'clock. (00:23:20)
Continuity mistake: When K sees the dead Chinese manager pinned to the wall, the manager's facial expression and position of his head changes between shots in a mere half second. (00:15:45)
Continuity mistake: When the cops are frisking J, the small cop on the left's left hand keeps changing position in every shot, with no logic whatsoever. (00:41:00)
Continuity mistake: When K tells J he's suspended, J moves his right hand away, yet when the angle changes it's back in its original position and he's moving it away again. (00:19:35)
Continuity mistake: As K is asking the little boy what his name is, the boy's arms are down at his side. As the camera cuts and he says his name is James, his hands are suddenly fiddling with his shirt tail. (01:33:35)
Continuity mistake: When the 60's cops stop J by the billboard sign, he pulls over by the left end of the sign. In the close-up, the car is parked right by the middle of it. (00:40:20)
Continuity mistake: When the Afro-American military man lays dead, his cap changes positions between shots. (01:33:10)
Continuity mistake: When the cop is about to dip his finger in the cake, its position and distance to the cake keeps changing in every single shot, with no logic whatsoever. (00:03:00)
Continuity mistake: When J chases Boris in 1960s New York he exits The Factory and runs on the sidewalk past a black car and a lamppost. A frame later, the car is gone and he's running on the pavement, on the space left, to allow him to step on the green car. (01:01:30)
Continuity mistake: At the 1960s HQs, K places his hand on a notebook. A shot later it has jumped next to a typewriter. (00:44:40)
Chosen answer: The gold saucer crashed in middle of the street was the ship Boris stole to get to earth. While they are in the restaurant Kay gets a call that tells him a ship was taken from lunar max and it was Boris who took it.