Gladiator Like Proximo (although he wasn’t real), gladiators were gifted a wooden sword called a “rudis” which symbolized their freedom from the gladiator life, if they so chose.
The Mummy The wraps used in Imhotep's mummification were accurate and there were ancient culutures that mummified the living, although Egyptians weren't known for it.
The Dark Knight Batman is extracted from Hong Kong using the actual methods of the CIA and a device called a Sky Hook, as mentioned by Morgan Freeman’s character (although the program actually started in the 50s, instead of the 60s as the movie says).
Jaws The crew of the USS Indianapolis really did get eaten by sharks after delivering an atomic bomb.
Indiana Jones and the Temple of Doom Dr. Jones returns, and this time it was with a human-sacrificing called called the “Thuggees”, which was a real Indian criminal fraternity from the 19th century.
Indiana Jones and the Kingdom of the Crystal Skull More than a dozen crystal skulls have been found and displayed in museums around the world, but they can all be traced back to an archaeologist/fraudster named Eugene Boban who created them in the late 1800s.
Jurassic Park Dinosaurs were more closely related to birds than reptiles and that's a fun thought to keep in mind. We're still in the age of the dinosaurs.
X-Men: Days of Future Past Richard Nixon’s tapes did feature mysteriously missing minutes. Probably not about mutants, but we really can’t be sure, can we?