Twin Magic

In Terminator 2, Linda Hamilton's real identical sister played as the Robot Clone of her character Sarah Connor. 

Her sister played the T1000, a robot that can mimic anything or anyone it sees and completely shape shift. 

Many people thought it was a special effect but it was actually her real twin sister. 

War Of The Worlds Movie Fact

In 'War of the Words' 2005 directed by Steven Spielberg, the grandparents are played by the stars from the original war of the words movie. 

The Grandparents in the 2005 war of the words are played by Gene Berry and Ann Robinson.

They were the main stars of the 1953 version of the movie directed by Byron Haskins. It is hard to tell they were the original stars because they were aged and only appeared for a short time. 

Back to the Future then Sponge Bob

The Voice of Flats the Flonder on Sponge Bob is Tom Wilson, he is the actor who plays Biff the Bully in back to the future. Flats the Flonder is a bully on sponge bob. 

Tom Wilson who plays Biff and Giff Tannen  in back to the future appears as the bully fish in sponge bob as the voice actor. 

The Thing Movie

The movie titled "The thing" is based on the Book called 'Who Goes there' by John Campbell. In the '80s version of the film, there are some differences from the book. In the book, the alien wasn't discovered by a separate Norwegian expedition. It was discovered by the same crew. 

Image generated by artificial intelligence 

In the book the alien has a default form, a creature with a humanoid shape and three red eyes. The creature also has tentacles in it's hair. In the book the creature doesn't need to eat or breathe because it has cold fusion proteins, the cells can get energy directly from water molecules by splitting it and fusing hydrogen. In the movie this ability is never exposed. The book also mentions that the cells of the organism are identical from the victim cells except for the nucleus. Most of the science is cut out of the movie.