Major goof! (SPOILERS)
I love this movie (even though at times the dialogue we're expected to believe between Terrell and Fa is really stretching it - especially at the very end). But there's a major goof that is so apparent: When Fa and Bee return after blowing up the boat with David and his cohorts, they don't have the harnesses on their backs! I don't see how Mike Nichols could have let that go - it really destroys the suspension of disbelief factor. When Fa and Bee are jumping out of the water over the gate to get home, it's a clear shot and no harnesses. There's a closeup just afterwards showing Trish Van Devere removing the harnesses, but it doesn't help things...
"Danny's not here, Mrs. Torrance"