Continuity mistake: In Goblin City, after the boulder positions itself on the edge of the wall, it falls on top of a talking gun/cannon, smashing it to smoldering bits, and it says, "Hey, no problem," in the close-up. In the next shot, as Sarah runs up the step to shout for Sir Didymus, the smoldering cannon bits on the ground are quite different. (01:26:05)
Continuity mistake: When Sarah reaches Jareth's throne room, before she says, "Oh no," there is a wide shot of the room. When she says, "That's the only way he ..." things in the room have changed position. (01:26:40)
Continuity mistake: When Sarah sees Toby in the Escher-style room, she jumps of the edge of the platform. As she jumps off, she raises one leg behind her other, yet in the next shot her legs are beside one another. (01:26:45)
Continuity mistake: When all of Sarah's friends from the Labyrinth fill her room, you can see that one of the Chilly's is on top of Sarah's canopy on her bed. In a wide shot the Chilly is hanging his head off of the canopy, but in the next closeup shot of him laughing his head is no longer hanging off it and is upright. (01:31:50)
Continuity mistake: When Didymus says "I say, does anyone want to play a game of scrabble" he has a staff in his right hand, and is holding it down by the side of Sarah's bed, but in the next shot he is holding the staff upright on top of Sarah's bed. (01:32:15)
Continuity mistake: When everyone from the labyrinth fills Sarah's room, Didymus says "I say, does anyone want to play a game of scrabble" and he has a party hat pulled well over his head. but in the next shot the party hat isn't pulled over his head, but is sitting on top of his hat, which allows the shot of it falling off of his head. (01:32:15)
Continuity mistake: When Sarah is finally back in her room, she sees Ludo, Sir Didymus and Hoggle in the reflection of her vanity mirror. Her white dress that lies on her bed changes position when seen on the real bed, the close-ups in the reflection and the semi close-ups in the reflection. (01:35:00)
Continuity mistake: When Sarah first meets the Goblin King, she has on Camel colored semi-formal flat shoes, but when she starts the labyrinth, her shoes have changed to brown suede loafers. She didn't change her shoes beforehand.
Continuity mistake: During the battle in the Goblin City, a Walking Cannon fires a shot at one of the rocks. When the rock shatters, the roof behind it and a jar at the right edge of the screen suddenly shift their positions - slightly but visibly.
Continuity mistake: When Hoggle is taking Sarah out of the oubliette, the lamp he lit goes out quickly just as they exit; yet in the shot of Sarah immediately after she comes out of the doorway, we can see behind Sarah into the oubliette and the lamp is still lit.
Continuity mistake: During the Magic dance scene Jareth throws the baby up in the air but when he lands he's turned 180ยบ.
Continuity mistake: When Sir Didymus threatens Ambrosius with no food to stop his retreat, as the dog walks back into the shot you can see the gray and white mixture on his head. In the close up, the dog's head is all white.
Continuity mistake: The two-headed axe the gate guardian grabs wasn't there when the gate closed.
Continuity mistake: As Ambrosius goes to cross the rocks, he switches from having gray and white on his head to all white, then back.
Continuity mistake: As Ludo pops up in the tower of the house in Goblin City, the roof goes over behind him and stops as if on a hinge. A moment later as he calls the rocks, the roof is missing.
Continuity mistake: When Sarah and her stepmother are arguing at the start of the film, Sarah's hair is completely soaked from the rainstorm, but a few minutes later, when she's at her vanity table and her dad is talking to her, her hair is completely dry, and there's no way she could have dried it that quickly, even if she used a hairdryer.
Continuity mistake: When Sarah kisses Hoggle, they fall through a hole and end up in the Bog of Eternal Stench. They walk the narrow cliff for a while and then Sarah falls onto solid ground and finds Luto right there next to her. Then Hoggle falls. Somehow, without Luto moving, Hoggle ends up under Luto. Luto never sits down. He is pushed to the ground when Hoggle falls on top of him. His butt is on the floor before Hoggle lands.
Answer: To add to that, the other door was supposed to lead her to certain death, and technically the oubliette wasn't exactly certain death.