Anachronisms: During Chaplin's 1921 trip to Great Britain, he rides a Southern Railway train, which pulls into St. Pancras Station. Southern Railway didn't exist until 1923. St. Pancras Station was owned by the Midland Railway, which became the London, Midland and Scottish Railway in 1923.
Anachronisms: A Western Electric 302 telephone appears in the 1930s. The phone was first produced in the 1940s.
Factual errors: Chaplin signs autographs and plays the violin with his right hand. In real life, Chaplin was left-handed.
Factual errors: When Chaplin returns to New York in 1952, the liner shown is the SS Normandie, a French ship which was destroyed by a fire in New York harbor in 1942. The following scenes show Chaplin on a British ship, flying the blue ensign.
Anachronisms: Towards the end of the movie there is a shot of the New York waterfront with the French ocean liner SS Normandie in the foreground, the subtitle showed the year as 1952. The Normandie was seized by the US government in 1942 and as she was being converted to a troop ship, caught fire and capsized at her dock. She was sold for scrap four years later.
Continuity: When Minnie Chaplin punches out the cop during the escape sequence, she is seen wearing high heels. But when walking to the car in the next shot, she can be seen wearing brown boots.
Audio/visual unsynchronized: When Charlie's brother and others arrive to whisk Charlie and his unedited film away to Utah, the car screeches to a halt. However, the car is on a dirt track and therefore no screeching noise would actually be created.
Revealing mistakes: When Charlie and his brother visit Fred Karno for Charlie's "interview", the opening shot shows a river with still water and a paddle steamer moves from left to right. The boat is moving a good deal faster than the paddle wheel is moving suggesting another power source.
Factual errors: During the scene where Chaplin demonstrates the power of silent films as Vaslav Nijinsky, he first gives him a high voice before correcting himself. Chaplin would've known very well what Nijinsky sounded like as he had met him numerous times in the 1920s and the two were good friends. (Source: The documentary "Chaplin Today" from the DVD release of City Lights)
Continuity: When Douglas Fairbanks swings down on the rope to meet Charlie, his foot is inside a loop at the end of the rope when he starts the swing in the wide shot, but when he lands in the tight shot, his foot is nowhere near the loop.