Continuity mistake: When Zorg is first seen walking, and the screen only shows his legs, there is an audible clank as he steps with his RIGHT leg. After that, the clank is heard from his left foot. (00:47:10)
Continuity mistake: When Zorg is showing the the guns to the Mangalores, he is seen shooting the Police dummy, and when he turns to show them that every shot fired afterwards goes to the same place, he is seen starting to fire from his right to the left, but when the camera angle changes he is seen starting from the right again. (00:49:35)
Continuity mistake: When Zorg is giving the weapons to the Mangalores in exchange for the stones there is a jump-cut. The jump cut occurs exactly in the middle of when Zorg opens the case then closes it. If you watch it closely you will notice the objects shift position. (00:50:15)
Audio problem: When the stewardess is telling the people that she's putting on the sleep regulator, they show a different shot, and you see in the background she's mouthing words that don't match up. (01:15:25)
Revealing mistake: When Zorg is talking on the phone with Mr. Shadow, a tube is briefly visible on his forehead. It is used to deliver the brown "goo" onto Gary Oldman's head a few seconds later. (01:16:30)
Continuity mistake: When the technicians are changing the radioactive fuel of the shuttle, they find shaking bugs and start to burn them. The bugs aren't shaking in one shot. (01:17:10)
Continuity mistake: When Zorg's henchman is on the phone with Zorg and Zorg blows him up. As the smoke clears and the fires die down, the body of the henchman is still standing at the phone. (01:18:55)
Continuity mistake: As Leeloo gets off the ship at Fhloston Paradise, in one shot she is looking slightly to her left and in the next shot from behind she is looking to the right. (01:22:40)
Continuity mistake: As Korben and Ruby ascend the stairs to the opera house, during the chase shot we can see all of their backs, but both before and after there are people behind them that would make this impossible. (01:26:20)
Continuity mistake: After Leeloo fights the Mangalores in the Diva's room but then has to give the stones box to Zorg, she throws it to him with forward rotation but when the box is shown flying through the air in slow motion, it's rotating backwards. (01:29:05)
Continuity mistake: When Leeloo is fighting the Mangalores in the Diva's quarters, one of them swings at her from behind. She ducks and turns her head, and in the next shot she has turned completely around as the Mangalore throws its second punch. (01:31:25)
Revealing mistake: When the bomb that Korben puts on the balcony explodes, there are two quick shots of the Mangalores. They are dummies because they've stopped shooting and don't move. (01:42:10)
Continuity mistake: After the battle when Ruby is being treated we can see Korben and Vito standing together in the background in front of the security monitors talking and Vito is no longer handcuffed. Then as Ruby screams it cuts away to Korben, and we are seeing Korben standing alone near the monitors with Vito still in the process of getting his handcuffs removed and only then does he approach Korben at the monitors. (01:43:57 - 01:44:26)
Continuity mistake: When Zorg returns to the flying hotel, he kills some security guards. When Korben and the others takes his shuttle to escape, their bodies have disappeared. (01:46:15)
Continuity mistake: When they are trying to place the stones in the temple, Korben picks up either the water or air stone - by the time they get to the plinth he's holding the fire stone. (01:53:15)
Continuity mistake: The shadow of the dark planet is heading in the direction of the sun, instead of away from it, in the scene where the dark planet is approaching the temple. (01:54:55)
Continuity mistake: When Korben is activating the Fire stone, shots on his face show the match level, but shots on the other three show the match angled toward the stone. (01:57:05)
Visible crew/equipment: Just after Korben escapes from the police, you can see a reflection of a crewman in a blue T-shirt on the windshield.
Revealing mistake: When Korben Dallas "negotiates" with the Mangalores by shooting their leader in the head, the small tube used to create the hole in the leader's head is visible.
Continuity mistake: When the cops go looking for Korben and Leeloo in the fog, there are two orange light sticks hanging from the ceiling inside their car. From the outside looking in they are swinging from side to side very quickly. But from the inside looking out they are swinging from side to side very slowly.
Answer: I looked it up and it is Jill Milan. If you do a search for her, it is in her credits as an actress.