Goofs

When Alan sits down on the arm of the couch, his sister Kathy puts her left hand on the couch arm near his leg. On the very next cut, she now has her left hand holding his wrist.

When Jane throws the money at Blake as he gets ready to make a call, he has his left hand hanging down by his side. On the next cut, his left hand is in his pocket.

Right after Don kisses Kathy in the car, he takes his left hand off her face. Kathy asks a question and the camera angle changes and Don's left hand is on Kathy's face.

The good Samaritan finds a large denomination bill on the bumper which supposedly fell from the money in the briefcase. All the bundles were tightly wrapped and intact when Jane dumped them into the trunk, so it could not have fallen from one of the bundles. The only way to get a bill loose would be to deliberately pull it out and drop it on the ground.

Jane tells Danny they're going to Coldwater Canyon, but moments later they turn into the Bel-Air Estates, which is miles to the west of Coldwater Canyon (which doesn't even intersect with Sunset Blvd., which Danny notes they've just turned off). However, in one possibly longer version of the film, she tells him they're going to Coldwater Canyon on a second meeting, which happens minutes later, with other scenes in between.

Jane tells Alan that the $790 she has spent represents about one tenth of a percent of the money in the satchel. Since they thought they had $100,000 (later determined by Danny the blackmailer to be $60,000). One tenth of a percent of 100,000 would be $100, so she spent closer to eight tenths of a percent of what she thought they had. A tenth of a percent of $60,000 would be $60, and $790 would be slightly over 1.3 per cent of that amount.