Continuity mistake: The Bird of Prey is the one captured by Kirk's crew in ST III. That ship's bridge showed Klingon Cmdr Kruge in his elevated command chair with his helmsmen arrayed circularly below him, and nothing else. ST IV has this same ship; however, the bridge now resembles The Enterprise layout with Kirk's command chair behind Sulu and Chekov at their rectangular helm, with Spock, Scotty, and Uhura at their usual positions.
Suggested correction: According to the captain's log at the beginning, they have been on Vulcan for 3 months. As they prepare to depart, we see several Vulcan technicians moving equipment in and around the ship. It's quite conceivable that the bridge was reconfigured according to the crew's specifications to facilitate their use of the ship. This may seem a bit excessive, as the remodel includes the door onto the bridge, and the frame of the door, and possibly most of the rest of the ship. But it's not outside the realm of possibility. The real mistake, though, is why they would go to the effort of installing new workstations on the Klingon bridge and marking them with Klingon labels, instead of standard Federation text. Interestingly, though, the "Starfleet" style bridge layout of the Klingon ship is being used by the Klingons on the Bird of Prey in Star Trek V.
Continuity mistake: When Johnny 5 nearly drives the snack wagon over the edge to where it is hanging, it appears to have miraculously moved right back from the edge, making it look like he never went nearly over in the first place.
Continuity mistake: In the Madison Square Garden fight scene between MacLeod and Fasil, Fasil's shades fall off after he rolls over a car, and the shot of them on the ground shows him running away in the reflection. McCloud stands over them looking around...and a few seconds later Fasil strikes a junction box, with his shades miraculously back on his face.
Continuity mistake: When the Marines first enter the reactor room, the "Mission Time" readout on the shoulder mounted cameras jumps backwards and forwards in time with every cut. (00:54:10)
Continuity mistake: In the battle scene at autobot city, Megatron orders Soundwave to jam the transmission that Blaster is sending to Optimus Prime. When Soundwave ejects Rumble, Frenzy, Ravage & Ratbat we see them flying through the air transforming simultaneously and and both Rumble & Frenzy are coloured the same (red & black) when Rumble is supposed to be purple. (00:15:08)
Continuity mistake: In the first successful teleportation of the baboon, there is one scene where Brundle's hands move from being straight to folded in just one shot.
Continuity mistake: When Seymour tries to kill the plant he pulls a gun, the gun is a six shooter, the plant grabs the gun and fires at the guy, then he fires some more, in total the plant fires 9 shots with a six shooter...
Continuity mistake: The amount of blood in the stains of Emilio Estevez's shirt changes between scenes. Sometimes they are small stains, close to the holes, then they are larger, as if blood seeped into the shirt, then they are smaller and slightly different in position in a later shot.
Continuity mistake: In a matter of 15 seconds between David's ship exiting the hangar and shooting 20 miles upwards into space, shadows on the ground indicate very different positions of the sun. (00:51:05)
Continuity mistake: The film is supposed to take place in 1917, but several of the german soldiers our heroes encounter are armed with Bergman M18 sub-machineguns which didn't appear until a year later. To make things even worse all the guns comes with a magazine-type that didn't appear until the mid-thirties.
Continuity mistake: During the chase scene where they attach the "engine killer" remote to the Dodge M4S (aka Wraith's vehicle), 2 Chevy Malibu Cop cars are barreling up the road towards the racers. Once the cops pass the starting line, the cars are now Dodge cop cars. (00:44:25)
Continuity mistake: When Andie goes out to get the oxygen from Daedelus she cannot reach it because her helmet won't let her through the structure of the space station, so Max offers to go and help her because he is smaller, but the only suit they can find is an adult one. After a lot of struggling they manage to make the suit smaller and he fits through the structure to get the oxygen but his helmet is the same size as Andie's so although his suit was smaller, he should not have been able to fit. Also notice how long her belt is when Max emerges from the ship. She would have to have about 30 ft of belt to wrap that much around him.
Continuity mistake: After Charlie shoots April in the ass with the slingshot, she immediately turns around to see who did it. Charlie is holding it as he says "Oops" and Brad takes it from him, all the while April is turned completely towards them. Couldn't she see it was Charlie and not Brad?
Continuity mistake: When the army takes Sheeta away, and throw Pazu in the dungeon, Pazu doesn't have his hat, nor is it anywhere in the room. And when he was able to come out, still no hat. But as soon as he leaves the fortress, it suddenly appears.
Continuity mistake: Outside of the museum a bunch of kids reach out and touch Howard. The hands appear and disappear randomly between shots.
Continuity mistake: When the robots are chasing the girls, the girls are all carrying make-shift Molotov cocktails made out of petrol cans with a rag in the neck. Suzie is hit in the leg by a robot and falls to the ground. The robot then fires a laser at the petrol can by her, causing it to burst into flames, which cover her too and burn her to death. However, when the camera pulls back, we see that her petrol can is mysteriously intact and untouched by the flames.