When Shahdov and the lawyer get into the taxi to get to the hearing, the fire hose is shown trailing behind the car. When the taxi arrives at the destination, the fire hose is entirely within the car.
When Rupert plays solitaire in Shahdov's room, the position of his hands changes between shots.
Errors in geography
While the movie is supposed to take place in New York City, while hailing a taxi the London car dealership of Jack Barclay is visible in the background.
During his diatribe, Rupert claims that the Roman Empire fell with the assassination of Caesar. Caesar's assassination occurred 17 years before the Roman Empire was established.
The TV station repeatedly shown in the movie has the call letters "KPXA." However, being in New York the call letters should begin with a "W" as stations east of the Mississippi River begin the letter "W" and not "K".
When Chaplin flies out of his country to the US, it is on a BOAC (now British Airways) Viscount, but when he lands in New York, he disembarks from a Pan American Airways plane.
When Chaplin's title character first meets the boy Rupert, the boy goes into an extended diatribe. Numerous times in the scene, the boy can be observed silently saying Chaplin's lines as well as his own, presumably as a way of remembering his cue.
In the last scene with Shahdov and Jaume, image is reversed as one can see by the reverse writing above the emergency exit sign above them and their jacket pockets with handkerchiefs and flower lapels are on their right side.