Factual error: The Smokers' plane is shown with every surface completely rusted reddish-brown. But planes are made from light alloys, not steel. They can eventually corrode - very slowly - but the film of corrosion is white, not red like iron rust.
Continuity mistake: When the Mariner escapes the Smokers for the first time, we get a wide shot of him at the helm. During the first shot, the boom is nearly straight over the boat and the outhaul is tensioned. In the shot afterwards, the boom is much further outward, and the outhaul now has lots of slack.Friso94
Revealing mistake: When escaping the Smokers for the third time, the Mariner picks up Enola and swings to the other side of the boat with a rope. But you can see a second rope going down behind Costner's back. At the ''handle'', it's tied up with the one Costner is actually holding on to. (01:18:25)Friso94