When the Las Vegas newspaper is first seen in Freeman's pocket at Soda City, it is folded so that the headline cannot be seen. When Kane looks toward the pocket, the headline catches his eye, yet when he reaches for the paper to pull it out of the pocket, it has the original fold with no headline showing.
The truck that picks up Barry Kane is pulling a different trailer when it arrives at Deep Springs Ranch, than during the previous night. When the motorcycle policeman stops the truck during the night, the trailer extends about five feet beyond the rear wheels. But when we see it in the morning, the rear wheels are right at the back of the trailer.
When Barry and Patricia jumped onto the rear platform of the last circus vehicle, there were only two other vehicles ahead of it. But on two later occasions we see that there are seven other vehicles in convoy ahead.
From the American Newsreel, Inc. Office, Patricia Martin uses lipstick to write a 4 line message on a blotter which she throws out the skyscraper window. A group of cab drivers below pick up the blotter. Viewing from over one cabby's shoulder, the message is now 3 lines. In a subsequent closeup, the message returns to its original form, followed by another over the shoulder shot showing the second form, again.
At the society ball, Barry and Pat stop by a dancing couple by the piano to talk to them. The man is shown moving and snapping his fingers then stops dancing in one shot, then is shown dancing again in a subsequent shot.
When Philip Martin brings out the meal for Barry, he says that it has stopped raining. But through the window we can see the rain still falling, and when Patricia enters, she is coming in out of the rain.
At Deep Springs Ranch when the maid Adele pulls a gun on Barry, one shot shows her holding the gun at her waist with both hands. A subsequent shot shows the gun near a pouch on her apron with her left arm by her side.
Moments after leaving Radio City Music Hall, Fry looks out his cab window and sees the sabotaged ship. Aside from the fact that the Brooklyn Navy Yard is many miles away, the Music Hall is on 6th Ave. in the center of Manhattan; no body of water of any sort is visible from that street.
At the beginning a Soda-Ash fire extinguisher is filled with Gasoline. Soda-Ash units are pressurized when it's turned upside down. This opens a stopper, releasing Sulfuric Acid into the water which is mixed with baking soda. This results in a large amount of CO2 being generated, pressurizing the canister. Without this gas the Gasoline would hardly come out.