Soon after the alien autopsy footage was broadcast on Fox television, serious doubts were raised about the authenticity of the film. Skeptics (and even many UFO researchers) branded the film a hoax, pointing out anachronisms and inconsistencies in the film. Yet because the Roswell story is so short on evidence, others clung to the autopsy footage as real. Earlier this year, the special effects artist who created the alien confessed that it was in fact a hoax.

Further reading:

Joe Nickell. "Alien Autopsy Hoax." Skeptical Inquirer, November/ December 1995.