When David Dunn opens the letter from Limited Edition, a close-up shows the envelope flap closed as he reads the card. From a different angle, the flap is open.
Two computers under Elijah's desk move three feet to the right.
Early in the movie David is reading a "Philadelphia Inquirer" newspaper. At the end this becomes a "Philadelphia Telegraph".
The position that the orange juice carton is faced when David's son sits down for breakfast changes between shots.
The position of the newspaper changes between David Dunn sliding it to his son and where it is when the son reads the headline.
Elijah Price/Mr. Glass has osteogenesis imperfecta but is very tall. People with this disease generally don't grow to be as tall as Samuel L. Jackson.
The "original" comic pages displayed in the gallery "Limited Edition" are too small. Comic book art is done on 14x17 pages, much larger than on display here.
In the movie Mr. Glass describes his disease (osteogenesis imperfecta) as a disease with 4 Types, that gets worse with every number, with for being the worst. This is not correct. Type 1 is indeed the mildest one, type 2 is lethal, type 3 is the worst one and type 4 is somewhere between type 1 and 3.
In Elijah's gallery, original comic book cover art is shown to be colored, when in reality, the production work is always in black and white.
When Elijah Price goes from Franklin Field to the train station on South Street there is a post with a "Subway" sign at the top of the stairs. There is no subway running under South Street. It is a train station entrance. The subways in Philadelphia run under Broad and Market Streets with a spur line that goes to Camden, NJ. There is, also, the Frankfort Elevated Line.
Mr. Glass describes his disorder (osteogenesis imperfecta). He describes the disorder as having 4 types each increasing in severity. At the time this movie was made only 4 types were identified. There are currently 8 types of the disorder identified as well as several subtypes.
David Dunn and a few other security guards are shown wearing FSU jackets and caps; this refers to the fictional Franklin State University where he works (the name derives from Franklin Field, the actual stadium name).
The baby in the opening scene is clearly shown pushing hard against his blanket with what seems to be an intact right arm. The doctor then states that the baby's arms and legs are broken. Also, the doctor doesn't unwrap the blanket to see the legs before he says they're broken. He may have assumed it, but doctors don't usually make exact diagnosis without looking first and just assuming something especially if the patient is right there to examine first.
David's wife could easily have resolved the gun incident by standing between her husband and her son, but maybe this did not occur to her at the time.
When Mr. Glass gets his first comic book on the playground bench in 1974, the cover of the book depicts as a backdrop the Philadelphia skyline, featuring predominantly Two Liberty Place, which was not built until 1990.
At several points they show comic book images which are supposed to be from the "silver age", the 1950s-1960s. However, the art displayed in them is not accurate for the period and is closer to the style predominant in the industry in the 1990s.
By the end of the movie, next to Elijah's desk, where the "Mudslide in Mexico" paper clip can be read with a typo, there is another clip with a headline in a weird Spanish that reads "133 Muere en Aeroplano Accidente." It should be "133 Mueren en Accidente Aéreo."
At the end of the movie, after it's revealed who Elijah is, the camera pans across his desk showing his research. One of the large newspaper headlines reads "Mudslide in Mexico: Kills All 'Expect' Newborn", but it should read "Kills All 'Except' Newborn".