Wild Bill is shown laying on a mattress on the floor after he tore up his cell, from which he gets up to request a drink of soda. After he is given the soda, he sits down on his bed which has a mattress. Shortly thereafter, he is again shown passing out on his bed.
When the guards are trying to subdue Wild Bill, he hits Harry with the back of his head, knocking him to the ground. For a brief but clearly visible moment, Percy is seen behind him, on the left side of the room. But before that and throughout the rest of the scene, he's on the far right side, frozen with fear.
The crumb from the cheese wafer that the guards feed to Mr. Jingles is lying on the floor after Percy throws his baton at it and is still on the floor when he starts chasing Mr. Jingles with a waste basket but is gone in the next shot when Percy throws the waste basket at the mouse.
When Mr. Jingles first appears and then scuttles under the door way, the mouse is male. During the scene where John Coffey shares his cornbread, Mr. Jingles is a female mouse.
When Percy is sitting at his desk reading a book on mental patients with the dirty magazine in it, Brutal and Paul come in and Percy jumps up closing the book and throwing it where it falls off the edge of the table. In the next shot when Paul picks up the book it is laying on the table opened to the page where the magazine is.
When Percy shoots wild Bill, there were 7 shots. A standard revolver only holds 6 rounds.
You can see a smallpox vaccination scar on the upper arm of the murdered girls' father in the opening sequence of him running through the field. Vaccination was widespread in the USA by 1935, the time of the movie.
Mrs. Detterick calls Klaus "Ralph" in the flashback scene when he is on the barn roof. She actually does call him "Klaus", although due to the slow motion it might sound like "Ralph".
As Percy leads John Coffey into E Block, he continues to announce, "Dead man walking!" The phrase "Dead man walking" is usually announced to other nearby inmates and staff that a condemned inmate is being led to their execution. However, Percy doesn't care about things like that and will say it even at the wrong times to taunt the prisoners.
After the execution, Brutus hands Percy an old Soda Acid fire extinguisher. The extinguisher is being held horizontally. The old style soda acid type extinguishers would automatically begin discharging the agent if the extinguisher was turned over onto its side, or turned upside-down.
The film is set in 1935 but Eduard Delacroix is reading a November 1937 issue of "Weird Tales".
Although Scotch tape was invented in the 1930s, it had a yellowish tint and would never have been used over a person's mouth. It did not have the adhesion of modern-day packing tape and would immediately come off from saliva.
In 1935, Jan asks Paul what the doctor said. Paul replies, "Oh, you know doctors - gobbledygook mostly." The word "gobbledygook" was coined by Maury Maverick in 1944.
Paul says "You'll do better to think of this place like an intensive care ward in a hospital". The term "intensive care ward" was not used until the early 1950s.
The clock in the execution room is a quartz clock. The quartz clock was invented in 1927 by Warren Morrison and was not even used in laboratories until the 1940s. So it is implausible that a quartz clock was used in a prison in 1935.
When John Coffey says "If she don't mind" when asked what he wants for his last meal, his jaw and lips do not move.
In the scene where William Wharton is attacking the guards when first being brought into death row, we clearly hear the sound of Brutal whacking Wild Bill over the head just before he actually hits him.
When Paul Edgecomb approaches John Coffey's cell after getting kicked in the groin, John Coffey asks him to come closer to the bars. When Eduard Delacroix warns Paul that he's not supposed to do that, Paul replies "Mind your business, Del." But if you watch Tom Hanks's lips, he actually says "Mind your own business, Del."
In the dolly shot up to John Coffey just as the truck pulls up to the Warden's house, crew members are momentarily visible in the reflection of the rear window.