During close-ups of front rank of kneeling soldiers at the Jallianwala Bagh massacre, a large number of spent cartridges are on the ground. In the last wide shot, the cartridges are gone.
When Gandhi tells the man how to escape from hell, the man prostrates himself at Gandhi's feet. Before, the man had tossed a piece of food on Gandhi's stomach. After falling at Gandhi's feet, the piece of food is gone.
Gandhi's round wire-rim glasses change from single lenses to bi-focal lenses many times.
When Gandhi is escorted into the office of the top prison official, the pendulum on the grandfather clock in the background jumps between shots.
When Judge Broomfield says "nevertheless, it is my duty . . .", the standing lamp on the right of the screen moves to the right.
In the opening scene in South Africa, the train's first class car is the forward car, closest to the engine. With steam engines, first class would be the rearmost car, farthest away from the engine's heat and exhaust. Second or third class would be closest to the engine.
In the film, the Indian flag is hoisted in broad daylight on Independence Day. In real life, it was hoisted at midnight.
The South African police arrest and beat Mohandas K. Gandhi for burning passes during his protest of the Pass Law. Gandhi and his fellow protesters were arrested for burning the passes, but neither Gandhi or any of the protesters were beaten by police during the protest.
Lord Irwin was born with a withered left arm and no left hand. In the film he has 2 hands.
Margaret Bourke-White was not present at Birla House for Gandhi's assassination, though she interviewed and photographed him a few hours earlier.
Electricity wasn't available in most Indian villages during Mohandas K. Gandhi's lifetime. When he tours India, the poles along the railroad right-of-way are most likely supporting telegraph wires, which were in place as early as the 1850s.
During the Amritsar massacre, crimped blank cartridges are feeding into the soldiers' rifles.
When the Pakistani flag is raised for the first time, "Qaumi Tarana" plays. Pakistan's original national anthem was a different song, written days before the ceremony, and it was changed after 18 months.
In the film, Hermann Kallenbach is alive in India at or near independence in 1947. He died in 1945.
In the film, the Calcutta killings happen after Indian independence in August 1947. They actually happened in August 1946.
Footage of a speeding steam train is shown during Gandhi's visit to Britain in 1931. The UK had 4 railway companies at the time (LMS, LNER, SR, and GWR), all of which proudly displayed their initials on their engine tenders. The train shown displays the logo of British Rail, formed in 1948.
An extra wears sneakers.
When Louis Mountbatten arrives as the final Viceroy, as the National Anthem starts he salutes "Army" style, i.e., "up the long way". He was a Navy officer, and wearing the uniform of the Royal Navy, so his hand would have travelled "the short way".
Muhammad Ali Jinnah smokes a cigarette. In reality, Muhammad Ali Jinnah has always preferred and smoked cigars.