Continuity mistake: After Sarah rescues Ludo, she approaches the "two ugly characters" on the doors. In the close-up, as it pans from one door to the other, the vines that hang between the two doors differ from the previous and following shots. (00:45:05)
Continuity mistake: When Jareth says "And Hoggle. If she ever kisses you..." between shots, the crow perched on the branch behind him is sitting on a different branch when he says the last part of the dialogue. (00:48:30)
Continuity mistake: Through the song "Chilly Down," a tree branch is seen, as one of the Fireys hangs on it. This branch is short in close ups, but much longer in wide shots. (00:49:10)
Revealing mistake: In many shots throughout the film it is very obvious when it is a blue screen, plate and/or matte painting shot, by the area around the subjects and/or the subjects' appearance or disappearance onscreen. Some examples can be found with the Fireys and Sarah, during the Chilly Downs scene, and later, when Sarah breaks the glass with the chair, part of her face disappears when she stands with the glass behind her. (00:51:00)
Continuity mistake: Just after Hoggle pulled Sarah up, away from the Fireys he is standing by the rope he used to pull her up. In one shot as Hoggle says "Down, go away" the rope is hanging down off the ledge, but in the next shot, all the rope is pulled up, away from the ledge, and is in one big heap. (00:52:30)
Continuity mistake: As Hoggle and Sarah fall out the end of the chute that leads to the Bog of Eternal Stench, look closer and you can see that Sarah falls through the end of the chute twice. (00:52:45)
Continuity mistake: When Hoggle and Sarah fall out of the chute that leads to the bog of eternal stench, between shots, the amount and position of leaves on the ledge changes constantly. (00:52:45 - 00:53:40)
Continuity mistake: Towards the end of the "Chilly Down" scene, the firey with the long thin mouth and ponytail on the top of his head jumps on Sarah. The others gather around her. Then the chubby firey says, "Come on, Come on!" calling over another firey; however, all five fireys are in the shot around Sarah. The following shot is of the top half of a firey bouncing over on his hands, but this is the same firey that already jumped on Sarah and is still on her. (00:53:10)
Visible crew/equipment: When Sarah and Hoggle are in the Bog of Eternal Stench and they almost fall in, look in the top left hand corner of the overhead shot and you will see a boom microphone. (Only on Blu-ray edition). (00:53:40)
Visible crew/equipment: Just after falling into the Bog of Eternal Stench, the duo are moving along the ledge. As it breaks away, there is an overhead shot where you can see a white and blue piece of equipment at the top left corner of the shot. I don't know what it is but it's not in the next shot so it's not something natural to the Labyrinth. (00:55:45)
Visible crew/equipment: When Sarah and Hoggle slip off the ledge at the Bog of Eternal Stench, Ludo breaks their fall below. As they fall, in the wide shot, the lines holding Sarah and Hoggle are visible. (00:56:20)
Continuity mistake: When Sarah and Hoggle slip off the ledge, at the Bog of Eternal Stench, they land on Hoggle, causing him to fall on his butt in front of particular rock face. However, in the following shot, before Ludo stands to release Hoggle, he sits about five feet further down. (00:56:20)
Continuity mistake: As Sir Didymus bangs the large grey brick holding the bridge up and says "Have no fear sweet maiden...", the large brick then suddenly falls. Between shots the amount of green fungus and moss covering the grey brick increases. (00:58:10)
Continuity mistake: Ludo holds Sir Didymus up by his staff and promptly drops him on the ground. He gets up, whacks Ludo in the knee with his staff and then his plastic staff bends and folds over as it hits the knee. Yet in the following shots his staff is creaseless and straight again. (00:58:10)
Visible crew/equipment: After Sarah meets Sir Didymus at the Bog of Eternal Stench, Sir Didymus climbs on Ludo's back. While he is up there, the bottom portion of Didymus' right hand 'puppet control rod' is seen being controlled on Ludo's right side. The top portion of his right hand control rod is seen many times throughout his shots. His left hand control rod is concealed as his staff. (00:58:20)
Continuity mistake: At the Bog of Eternal Stench, Sir Didymus is on Ludo's back and whacking Ludo on his head repeatedly. In the next shot Ludo bends over and Sir Didymus, who holds a clump of Ludo's hair in each hand, flips over Ludo's head. Sir Didymus' staff falls in front of Ludo's face between the clumps of hair onto the ground at his feet. Yet after Ludo sends Sir Didymus flying, way behind him, Sir Didymus jumps out from behind the rock with the staff in his hand. (00:58:25)
Visible crew/equipment: At the Bog of Eternal Stench Ludo summons the rocks with his howling, and we then see one shot of a rock rolling forward. You can see a thick wire attached the centre of the rock, pulling it forward to make it roll. (00:58:40)
Continuity mistake: When Sarah is hanging on the branch over the bog, Ludo calls a rock and the rock rolls into the bog, and is pretty round, with no large flat areas on it. However when it's floating in the bog, Sarah jumps onto it and the rock now has a very large flat area. (00:58:45)
Audio problem: At the Bog of Eternal Stench, as they start to walks across the rocks in the bog, Didymus says "Steady, steady boy. Come on Ambrosius! Just close your eyes, and go!" His mouth doesn't move at all when this is said though. (00:59:50)
Continuity mistake: When Sarah crosses the Bog of Eternal Stench, the bridge rails break, and then the bridge plank under her gives way and falls into the bog, while she clings to the tree limb. However, when Sir Didymus says, "It seemed solid enough," the left rail and the bridge plank are actually still intact. (01:00:25)
Answer: The necklace is a symbol of Jareth's power throughout the story. All the time that Sarah is in the Labyrinth, Jareth has more power than her, because she doesn't really know what she's doing, and isn't taking one particular path, just getting lucky at the right times. At the end, as we all know, Sarah triumphs, and Jareth's necklace changes to admit his defeat.