Films With Real Dead Bodies
Poltergeist, Tiny Fox Lab

In the movies Poltergeist, the House on Haunted Hill, and Frankenstein, they used real dead bodies was common due to cost reasons.Tiny Fox Lab Facts

Preview photo credit: Poltergeist
Source: https://www.cheatsheet.com/entertainment/the-poltergeist-yes-those-are-real-skeletons-terrorizing-jobeth-williams-in-the-pool-scene.html