Visible crew/equipment: When Nada is escaping with Holly, you can see the reflection of the film crew on the car.

Continuity: When Roddy Piper first puts on the sunglasses, he stops at a newsstand, where he sees his first alien. Watch as the alien guy pays for the magazine he's buying. The vendor gives him change twice, and even says different things to him each time he hands him the change: 1. "Here's your change sir." 2. "Here you are sir. Thank you."

Continuity: In the big fight scene, Roddy Piper and the black guy are wrestling and struggling about and land so the black guy's pants are getting soaking wet. In the very next shot as the fight continues, his pants are dry.

Revealing: During the big fight scene, you can tell easily that the black guy is wearing knee pads (try looking when his pant leg is wet). Construction workers will often wear knee pads for work but most often they wear them on the outside of the pants to save the knees of their pants.

Continuity: When Nada reads the magazine at the book stand, he removes the glasses, you can see that there's a graphic on the right page but when he put them back on in the following shot, the page is different.

Continuity: After Roddy Piper's character spends the night at the homeless camp, he walks towards the church wearing a toolbelt. He stops and watches the Street Preacher recite what is airing on television. As the shot switches back from the Preacher to Piper, his tool belt has vanished.

Continuity: During the big fight scene, Roddy Piper smashes the back window of a car with a piece of wood. In the very next shot, the black guy Piper is fighting with rushes Piper and continues to fight with him. Right before the shot ends, you can see the same car in the background, smashed window and all, now at least two cars over from where they are fighting.

Continuity: During the big fight scene between Piper and the black dude, they begin to grapple and roll over. Piper's belt becomes buckled and unbuckled between various shots.

Continuity: Rowdy Roddy Piper is in a car, trying to escape from the aliens and is ducking down by the front door lock. In one shot the door lock is up. In the next it is down. Then up, then down...

Continuity: When Nada and Frank are trying to get to the roof of the television building, at some point they shoot at two guards and a worker runs away. In the following shot, that same worker is closer to them.