Themes of tweens on the verge of puberty, of whether it's better to grow and mature into an adult, or to remain full of child-like wonder and playfulness at the expense of never really changing and maturing.
A lot of fantasy violence, including swordfights, guns, and hitting below the belt. Pirates are killed, often comically by Captain Hook when they speak to him out of turn. There is a brief graphic image of Captain Hook's amputated arm as he puts on one of his hooks. He kills another sailor with his hook. Crocodile attacks. Demonic imagery: Mermaids might look nightmarish to younger or more sensitive kids.
Brief nudity of two boys' bare behinds, nonsexual, the result of hanging upside down from a trap. There are a couple of sweet kisses and some references to puberty.
Adult characters, both in the world of adults and Neverland, drink and smoke. A pirate offers liquor and cigars to a child.