Factual error: Haloclines are referred to throughout, and depicted occasionally as some sort of underwater tornadoes. Haloclines are in fact just salinity gradients, and look nothing like they do on the show.
The Triangle (2005)
1 factual error in show generally - chronological order
Starring: Bruce Davison, Eric Stoltz, Lou Diamond Phillips, Catherine Bell
Character mistake: The characters state that the Atlantic is the deepest ocean, but it's in the Pacific Ocean that the deepest point, Challenger Deep, is located.