1Jabba The Hutt

Jabba The Hutt puppet was 2,000 lbs, took 3 months to build, 3 men to operate and cost half a million dollars to construct.
2Frankenstein

The "bolts" in the Monster's neck in Frankenstein (1931), are actually electrodes. One is positive and the other, negative.
3Xenomorph

The inner mouth of a Xenomorph from Aliens is called a pharyngeal jaw, and Moray Eels have them.
4T-1000

The T-1000 evolving noise from Terminator 2 was made with a condom covered microphone stuck into a flour/water mixture.
5Gremlins

The monsters from the movie 'Gremlins' were thought to represent the negative stereotypes of black people.
6Pennywise

The droopy lip and lazy eye of Pennywise, the clown in “It” wasn’t CGIed; Bill Skarsgård who played Pennywise did it on command.
7Candyman

Actor Tony Todd put actual bees in his mouth while filming a scene for Candyman.
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8Dementors

Dementors from the Harry Potter series were inspired by J.K. Rowling's bouts with clinical depression.
9Smaug

Smaug the dragon originally had 4 legs in the first Hobbit movie but was changed to having 2 legs and 2 wing-arms in the second Hobbit movie.
10Balrog

The Balrog in the Lord of the Rings trilogy was just one of many that lived in Middle Earth. They even had a king named Gothmog.