Common Sense Note
Parents need to know that 20,000 Leagues Under the Sea is Disney's version of the classic 19th century Jules Verne novel of the same name. Some old stereotypes come through in scenes where island natives are portrayed as primitive and brutal. There are no female characters with speaking roles in this film, either. Lots of punching among sailors, and some perilous scenes with a giant squid might frighten younger viewers.
As we see in the first scene, when two dolled up gals are hanging on his arms, Mr. Land is good with the ladies. He sings songs about women whom he wants to kiss. He talks about "native" women on an island who are longing for his touch.
Fisticuffs are pretty common among these sailors. Some fighting gets pretty extreme, though there is no blood. Cannon fire and ship collisions sinks ships. "Cannibals" are electrocuted and ridiculed while they dance in agony.
"Hell" is as strong as it gets.
Some mixed messages about justice and the value of human life. Captain Nemo wants to destroy slave ships because he was once a slave, but he kills everyone on board as a consequence. He is viewed as a madman, but his evil genius is also admired. Electrocution of natives is played for comic effect.
Drugs / Tobacco /
Men smoke cigars in many scenes. Mr. Land says that in a case of bad luck, there is "nothing to do ... but get drunk." This he does, with the resident seal as his drinking buddy. He then is very moody and throws a glass against the wall.