Bare Midriffs Are Feminine: The polynesian woman that Martin, Diana and Java meet at the island shows her navel while the male natives are shirtless.
Blob Monster: The Black Spirit, a broadly humanoid mass of grey slime.
Endearingly Dorky: Java's attempts at looking cool end up like this. Luckily a polynesian girl returns his charms, to Diana's annoyance and shock.
Everyone Has Standards: The polynesian woman mentions that while the oil rig workers weren't welcome on the island, she and the rest of her people are glad they're all safe.
Evil Is Not a Toy: The shaman found out that trying to use an ancient slime spirit against the oil rig workers was a bad idea.
Heel–Face Turn: The shaman apologizes for his actions after Martin defeats the Black Spirit.
Leeroy Jenkins: Martian and Java decide to go guns blazing against the natives. It goes as well as expected and all three are captured.
Nice Job Breaking It, Hero: Martin destroying the shaman's crystal means no one can control the Black Spirit.
Rapid Aging: Those drained by the Black Spirit suffer from this.
Well-Intentioned Extremist: The shaman only wanted to punish the oil workers who were polluting his island.