The top mistakes in The Big Sleep (1978) http://www.moviemistakes.com/film5078 en Sat, 30 Aug 2008 05:55:26 +0000 87595 A car is driven off a dock into a body of water. Before the car hits the water, special effects shoot up about 10 different blasts of water. 113314 When the taxi driver sets off in pursuit of the white truck, only the driver is seen at the wheel and Robert Mitchum is not sitting in the back. In the next shot of the taxi, Robert is seen in the back of the taxi.