Continuity mistake: When the two men are carrying water up to their new cave home (via a home made elevator), one of the men is holding two buckets of water. In the shot where you can see the sea behind them, this man hands the second man a bucket of water, which he takes. In the very next shot, from inside the cave, the first man has both buckets and again hands the other man the bucket of water. (00:48:35)
Continuity mistake: When Elena is attacked by the giant bird she is knocked to the ground face up. The bird puts its foot on her and she's face down. A later scene she's face up again.
Continuity mistake: Shortly after they take off in the balloon they had to knock out the Reb. They decide to throw him out. As they reach down to grab him, he starts to wake up. When they bring him to the edge of the basket he's out again.
Continuity mistake: After they've been on the island for awhile, Neb finds a chest floating in the water. It's about 6 feet long, made only of light colored wood and has two wooden bands around it. When Neb pulls it to shore it's a completely different chest. Now it's shorter, made of reddish colored wood and has iron fittings.
Continuity mistake: They flip the giant crab on its back and start to slide it toward the geyser. The next shot is just before the crab goes into the geyser it's now right side up. It hits a rock and flips landing into the geyser on its back again.
Continuity mistake: Nemo's explosion is right under the cannon which are near the back of the pirate ship. Aboard the submarine, Nemo is talking about raising the ship. There is a drawing of the ship on an easel and it shows the hole near the front of the ship.
Continuity mistake: As they are approaching the island, they have to climb into the ring above the balloon and cut the basket loose. It switches back and forth from long shots to close shots. In the long shots, the ring is at sea level bouncing off the waves. In the close shots, they are 10-15 feet above the water and some of them jump into the ocean.
Continuity mistake: After the battle with the crab, Neb has a shirt on. When they climb the volcano he doesn't have a shirt on and doesn't have it with him. They spot the boat and go down to find the women on the beach. Here he is wearing a shirt again.
Continuity mistake: Herbert jumps onto the back of the giant bird. In the close shots, he starts to stab it with the knife in his left hand. In the long shots he's holding on with his left arm.
Continuity mistake: Not long after being stranded on the island, Mr. Spilett is cooking a giant oyster. He cuts a piece with a bayonet and with his left hand offers it to Pencroft who refuses it. He then turns to offer it to Herbert but now the oyster is on the end of the bayonet.
Continuity mistake: The first time the castaways meet Nemo, he is leaning on a spear with both hands wrapped around the shaft of the spear. At one point he puts his right hand down by his side. The shot changes and both his hands are instantly back on the spear.
Continuity mistake: When Herbert and Elena are being walled up in the honeycomb, the shots showing both people and the entrance show them leaning against the side wall. The shots showing them from the front show them leaning against the back wall. This is repeated every time the shot switches back and forth.
