Goofs

When Juan Sánchez Villa-Lobos Ramírez was killed in the prison, he had the Samurai sword with him, and Connor MacLeod ran out of the prison with his other sword. In the final fight, MacLeod has the Samurai again.

In Highlander Ramirez says he is the chief metallurgist to King Charles V of Spain, in Highlander: The Quickening, when they are about to drive inside the prison, he presents himself as Ramirez the chief metallurgist to King Phillip II of Spain, this is impossible as Ramirez was beheaded by the Kurgan in 1542 and Phillip II of Spain only became king in 1556.

When Katana is "beamed" to Earth, he is not wearing gloves. When he arrives on Earth, he is wearing them.

During the raid on the shield generator near the start of the film, we see 4 characters slide across the zip-wires but when they enter the interior there are 5 of them. When they leave, the guards shoot 2 but then 4 are shown running across a walkway. The next shot shows a monitor with 5 people running down a corridor.

Katana brushes his coat against the energy shield and loses a piece. The jacket is intact for the rest of the scene.

Either the future clothes are fire resistant, or become immortal too after the quickening. MacLeods clothes are fully intact when he steps out of the fire from the tank truck explosion.

The coordinates 33° 26' N, 60° 42' W are a point in the middle of Atlantic Ocean, east of Bermuda.

The playbill at the beginning of the movie misspells the title of Wagner's opera "Götterdämmerung" as "Gotterdammerung" - a mistake a real opera house would be very unlikely to make.

Katana, who has never visited Earth, knows about league draft rules and the Wizard of Oz. He monitors MacLeod through a screen, and he could have learned about them through it.

Ramírez admires himself in a wall of monitors just before he is fitted for his new suit. A pedestrian walks between Ramírez and the camera, but doesn't show up on the monitors. This is because the camera is zoomed into Ramirez' position on the sidewalk and it does so from a high angle. The pedestrian complimenting him on his clothes is standing close to the store's window and is simply out of the shot because of the angle.

Ramirez and MacLeod enter the prison with a car. The guards shoot the car with machine guns from all sides. MacLeod's friend Louise Marcus, in the trunk of the car, survives unhurt.

That is because they were shooting into the passenger compartment, not the trunk, which had no bullet holes, as can be seen at 01:24:22.

In the Renegade version, the closing credits list Bruno Curichelli as "Zeist Chief Justice" even though that version eliminated the Planet Zeist plot.

There are at least three versions. There is no canon.

When Connor and Katana fight around the energy shield, they destroy several railings. After Katana burns his hand, the railings are intact again.

Not so. The damage is still seen at 01:41:47, as they are ready to destroy the shield and again at 01:42:33 after it's destroyed.

When Katana throws Blake out of a window, the figure that hits the ground is a very, very obvious dummy.

When the subway car is speeding out of control, a quick shot shows an obvious dummy blowing around.

The Shield is apparently supposed to give the impression of night throughout the Earth 24/7, but when Ramirez enters the tailor shop in Scotland, daylight can clearly be seen shining from the windows.

Incorrect impression. Without daylight, everything dies.

In the theatrical film, it's established that the citizens of Zeist are not immortal on Zeist, but are once they get to Earth. In The Renegade and Director's cuts, all references to Zeist removed, instead having them sent from the distant past and explaining that they're already immortal in their own time instead of becoming immortal. Despite this, the extended cuts retain a scene where Connor is explaining his past and confirms that he wasn't immortal where he came from.

There's no canon between the various versions.

In the fight scenes in the beginning of the movie, the lines suspending the actors in the air are clearly visible.

When MacLeod fights villains after leaving the bar, support wires are visibly attached to one villain's flying device.

Ramírez walks through modern-day Scotland, yet no one he speaks with is Scottish. The confused actor uses a Cockney accent, the man on the street complimenting Ramírez's clothes has an American accent, and the tailor has an upper-class English accent.

In the latest census only 62% of people said their identity was Scottish. So, one out of every three people without Scottish accents.

In the Renegade Cut MacCleod and Louise climb a ladder inside a mountain and get above the shield, yet planes routinely fly in this same world. Commercial flights routinely fly several thousand feet above the peak of any mountain in North America.