Goofs

As Vera is going through the glove box at the used car dealership, 3 bolt holes, for the rear-view mirror, are clearly visible between the brackets for the sun visors (which are also missing!). The rear-view mirror had been on the car in previous shots. After they leave the used car lot the mirror reappears. In the following scene at the drive-in, the mirror disappears and reappears between shots.

The convertible is a Lincoln Continental, but the year of it is ambiguous. In front views and some rear views it's a 1941 model, but in other rear views and in a side view, it's a 1942. Watch for the differing taillights.

After meeting up with Roberts, Vera's hair continually changes whilst riding in the convertible.

As Haskell tells Roberts that he had not been home since he was 15 years old a cigarette appears in his hand, seemingly out of nowhere.

Whilst Al is playing piano and Sue is standing next to the piano, Al's cigarette length changes abruptly between shots.

Al says that the driver has three deep scratches on his hand "about a quarter of an inch apart," but then the hand is shown, and the scratches are much further apart, more like three quarters of an inch.

In the first shots of Al hitchhiking, the film is reversed. The cars are driving on the wrong side of the highway and the drivers sitting behind the wheel are sitting on the right side of their vehicles.

Haskell claims to be a bookie driving from Florida to Los Angeles to place a huge bet on a horse. Being a bookie, Haskell would know that he could contact a bookie in Los Angeles to place the bet for him and transfer money by wire or mail. The trip to Los Angeles therefore seems unnecessary. However, it is established elsewhere in the film that Haskell has ulterior motives for his trip, and that he almost certainly wasn't telling Al or Vera the truth (or at least not the whole truth) about his dealings.

In the Reno diner, Joe the truck driver asks Al about his plans. Al says he is headed east, and Joe tells him he is driving north to Salt Lake City. Salt Lake is east of Reno.

Salt Lake is actually northeast of Reno. Depending on the route Joe was going to take (well before the interstate highway system), he may well have first headed north before going east.

Several of the scenes of Al traveling across country are reversed images. When he first starts his road trip to California he is seen getting into what appears to be the driver's side of the truck, and in the next scene he is seen riding in a Model A, which seems to have right-hand drive. These scenes and others have the film stock reversed to give the impression of travel from east to west.

Near the beginning of the film, there is a scene in which Al Roberts gets into three different vehicles (a truck and 2 different automobiles) as he hitchhikes from New York to Los Angeles. All three vehicles are right hand drive instead of left hand drive (the configuration in the United States). This is probably due to a film reversal. Reversing the film is likely intentional so that the vehicles in this scene appear to be heading West (right to left on the screen).

When Al is playing the piano he is not pressing any of the keys, just moving his fingers across the tops of them.

When Al and Vera are in the car approaching Los Angeles, he turns left at one point without turning the steering wheel.

As Al and Vera drive to the auto yard to sell Al's car, Vera says she plans to 'go back to that place on Hollywood Boulevard, where I saw the fur jacket.' As revealed by various landmarks in the background, they are already driving down Hollywood Boulevard, which makes this a strange thing for Vera to say, or at least a strange way to phrase it.

At the beginning, as the characters walk along Riverside Drive in Manhattan, they pass street signs reading 73rd Street, then 77th Street. In Manhattan all numbered streets are divided into east and west, so the signs should read West 73rd Street and West 77th Street.