Corrected entry: Andy gets a poster of Rita Hayworth when he comes into his cell after his stay in the hospital, and when Red is explaining how Andy broke out, it shows him digging behind her. However, when it is found that Andy escaped, the warden throws a rock through a picture of a cavewoman (Raquel Welch) and it goes into the hole Andy dug. This poster is not the same as the Rita Hayworth one, and it appears to be on the opposite side of the cell as before.
Corrected entry: The "Archie and Friends" comic the guard is reading on the toilet when Andy starts playing opera over the intercom is an issue from 1993, nearly 50 years after the movie takes place. Archie Comics are thanked in the end credits for providing the comic, and the copyright also verifies that it is from 1993.
Corrected entry: In the scene where Warden Norton is talking to Tommy, he offers a cigarette to Tommy but is not smoking one himself. At the end of the conversation, he drops a partially-smoked cigarette and crushes it out, then walks away. It isn't Tommy's cigarette, because when Tommy is lying on the ground, you can see his cigarette beside his right hand.
Corrected entry: When Red finds the metal box in the field, there has been enough time pass for seasons to change. In Maine this means rain, snow and melting snow. How that metal box with one loosely wrapped plastic bag kept all the papers perfectly dry is not easy to believe. Even one year of seasons would cause it to look much less pristine than it looks when Red opens it.
Corrected entry: It's unlikely that raw sewage would have been permitted to flow directly from the prison into a creek, even in a rural Maine setting. This prison would have been equipped with a rudimentary sewage treatment system of some kind, such as a septic system. The screenplay had to omit the septic system since you can't crawl through it to your freedom.
Corrected entry: When Red is doing the voice-over of how Andy escaped from the cell, it shows Andy undressing to reveal the warden's shirt and tie. The cell clothes Andy is wearing at this point are a shirt and jeans. Yet the next morning when the search crew finds Andy's clothes in the river, they hold up dungarees on a stick. (01:50:10)
Corrected entry: When Brooks is on his book delivery tour he stops and says "Books" at each cell. Red gives him the parcel with the rock hammer to pass it on to Andy. The camera cuts to Andy, and you hear Brooks call "Books" twice before he even reaches his cell, although both cells are right next to each other. (00:29:10)
Corrected entry: When placed in solitary confinement Andy tells the warden that "everything stops", meaning that he intends to stop working on the corrupt financial schemes in operation at the prison. Why on earth would an intelligent man like Andy Dufresne make such a threat? There is no hint that he is bluffing, even though he must surely know that he cannot meaningfully threaten the warden, a man who has absolute power over life and death in the prison and even that is beside the point! The financial schemes operated by Andy are there to ensure HIS prosperity, not that of the warden. "Stopping everything" would deprive him of the key to his new life in Mexico. By the time he is sentenced to solitary confinement Andy's escape plans are very advanced; he must be at least two thirds of the way through the prison wall by that stage. His picking up the funds deposited in false names in banks throughout the area is an absolutely essential part of his escape to Mexico and it would be pointless and stupid for him to endanger it in any way, or even to threaten to do so. It is essential that he stays in his "one bunk Hilton" and maintains his access to the warden's financial dealings, and he would know that.
Corrected entry: Andy leaves his prison shoes behind in a shoe box for the warden to look at as the escape siren begins to sound. He wears the warden's polished shoes while returning to his cell the night before. As Andy lowers himself onto the sewer pipe after coming through the wall, you can see he is wearing his "high-top" leather prison shoes and is not barefooted or wearing the warden's shoes before he breaks into the sewer pipe.