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.
Carlos offers to take Jane to a Jai Alai game, but despite the name sounding Spanish it is actually a Basque sport played in the Pyrenees mountains and would not be something the Mexicans would play. This is a common mistake people make, but the Spanish and Basque do not get along so no Spanish country would play the sport.
When Don Blanchard was trying to get Lt. Breach to dredge the lake looking for the body of Alan Palmer, he could have offered as evidence that Jane Palmer held a gun on him, took the claim check, then knocked him out, all which could be corroborated by Kathy Palmer, and also that Jane was working with an accomplice that he saw coming out of her apartment. As Lt. Breach said they only act on a missing persons report "...if there's some evidence of foul play..", this should have been enough evidence that Jane was caught up in criminal activity to warrant dredging the lake. Not a goof: There is no evidence that he disappeared in the lake, and dredging it would be a very expensive endeavor.
Kathy, Jane's sister-in-law, is a single woman, yet she is wearing a fashionable blouse that buttons up the back when she searches the Palmer's apartment after her brother disappears. Though she could have used a zipper hook helper instead of assistance from another person. Not a goof: The blouse is loose enough that she could have easily buttoned it by herself.
The entrance door of Alan and Jane Palmer's apartment does not have a peephole. However, most residential apartments have a peephole; therefore, the apartment was probably either built on a sound stage or is an office made to look like an apartment.
The good Samaritan finds a large denomination bill on the ground which supposedly fell from the money in the briefcase. All the bundles were tightly wrapped and in tact 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 backs up and trips over the suitcase holding the money, falls over the balcony, and lands on the ground as bills flutter to the ground all around her. While very dramatic, there are five (5) major errors.
1) The suitcase was sitting on the sofa not on the balcony next to the rail. 2) The money was shown strewn around on the balcony which is why it supposedly fell, but it was actually inside the suitcase. 3) The money was wrapped tightly with band so there would not be any loose bills to flutter to the ground. 4) The money on the ground was Mexican Pesos not American dollars. 5) One or more bills were under her hand which could not have happened since the bills fluttered down slower than her body.
1) The suitcase was sitting on the sofa not on the balcony next to the rail. 2) The money was shown strewn around on the balcony which is why it supposedly fell, but it was actually inside the suitcase. 3) The money was wrapped tightly with band so there would not be any loose bills to flutter to the ground. 4) The money on the ground was Mexican Pesos not American dollars. 5) One or more bills were under her hand which could not have happened since the bills fluttered down slower than her body.
Since she fell off the balcony backwards, she would have landed face down, due to the rotation of the fall.
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 13 per cent of that amount. So, in any case, the screenwriter was bad at math.