Goofs

In the last scene, when Claude is trying to escape through the drainage pipe, the pipe is at least four feet high when it is supposed to be only two feet.

The convertible is parked alongside the secondary track with a rolling train in the background (rear projection) waiting to pick up Claude from the train station. A few scenes later it's parked near a parking lot with baggage carts off the passenger side where the tracks and train were earlier.

In the opening credits, there are several toiletry items on top of the medicine cabinet in Claude's room. In subsequent scenes, the top of the medicine cabinet is bare.

George and Marc are sitting at a railway station in LA waiting for Claude. Behind them a train pulls in (back projection of library footage). Its a Southern Pacific train in red and orange livery. The next shot is Claude departing a train. But this train consists of unpainted stainless steel cars.

Claude gets off a train at the former Southern Pacific Railroad station in Glendale, Ca. He has supposed to have traveled cross country but that station is on the north/south coast route from San Francisco/Oakland to LA.

Man in hospital bed. Claude crimps his oxygen hose with fingers and also rotates the valve on the tank but it's to the left which normally would open the valve instead of to the right which would shut the flow off entirely.

Claude crawls through quite a length of drain pipe and the crawl space beneath Billie's house, but emerges into her living room with no dirt on his clothes or person.

When Claude, Marc, and George are on the hill overlooking the home of Billie Williams, they see her in a window. No one guarding a material witness would allow an uncovered window in the house, let alone allow the witness to look out of a window, particularly a window facing an unsecured hill.

As already noted, the drive around Los Angeles was shot in a studio except for the shot from behind when Vince Edwards's hair blowing in the breeze. That was shot from inside a moving car. When shot from the front, inside the studio, his hair doesn't move.

Policeman James William Mayflower only dials six numbers when he calls the department to register Billie Williams' complaints. Phone numbers in LA at that time all had a three digit prefix (two letters and a number), followed by four numbers.

When George raises the trunk lid to prepare the flaming arrow, the open gas can is visible sitting in the trunk. After he finishes, he puts the lid down with the can still open.

The contract stipulated that the witness should be murdered before the 18th, as that was the date she was testifying. The botched attempt to kill her takes place on the 17th (the police guard in the house comments that 'she's got to get up on that stand tomorrow'). Claude finally gains entry to the house at the end of the following day (the 18th), so the witness would have already given evidence by that time.

In Billie's living room, the couch is facing away from the television - she has to sit up and look over its back to see the set, a very odd arrangement.

The three are sitting in the front seat at the gun store showing a parking attendant leaving the Corvette and trotting up to the Nash in the background via rear projection.. Marc gets out and you spot two walking pedestrians on the right with a white panel wagon entering the lot. After a couple of brief over the shoulder close up shots the pedestrian & panel truck are repeated again.

When Claude meets the ex-maid Miss Wiley to ask information about his victim Billie Williams, the maid is painting the walls. Looking at the paint roller, it is seen there is no paint on it. It looks dry and rough.

On the way to see the Pacific ocean they're being followed by a dark pickup truck (rear screen projection). Truck starts to move into the lane next to him but jerks back because there's a car already there.

When the three are driving around in Los Angeles, it is very obvious that the car is in the studio in front of a projection screen. You can see that the windshield has been removed and studio lights are reflected in Claude's sunglasses.

In his first contract killing, it appears that the supposedly meticulous Claude leaves three witnesses alive in the barbershop who could identify him.

With Claude watching the house in carrying out the imminent "bow and arrow" plot, he should have seen Wexley entering the house and, thus, have known there was another woman inside.

It is incomprehensible how Claude has managed to place an explosive device in a TV inside a house, which is guarded by the police.