Plot hole: When the warden comes into the cell the morning after the escape, the poster covering the hole is fastened down on all four corners - impossible to do after squeezing into that small hole. [On the DVD commentary, the director confirms that this was a movie "cheat".] (01:49:05)

The Shawshank Redemption (1994)
1 plot hole - chronological order
Directed by: Frank Darabont
Starring: Morgan Freeman, Clancy Brown, Tim Robbins, William Sadler, Bob Gunton, Gil Bellows
Character mistake: Red says that Andy crawled to freedom through 500 yards - 'just shy of half a mile'. 500 yards is far less than half a mile; in fact, it's less than a third of a mile. It is however just shy of half a kilometer, which may be what King was thinking of when he wrote the book.
Andy Dufresne: Get busy living, or get busy dying.
Question: What exactly is the scam Norton is running?
Chosen answer: In a nutshell, tax evasion. He's running the prison like a company doing building work with, as its described by the builder in the movie, a pool of slave labour to allow him undercut other contractors. He is skimming profit for his own pockets, along with taking bribes, etc. that Andy's creative book keeping is hiding from the IRS.





Suggested correction: It's a shame the director surrendered, but for someone as smart as Andy, this is the smallest of problems. He could've put weights on the bottom of the poster, or used magnets he embedded in the walls together with iron glued to the poster, or enough washers in the bottom to essentially do both.
dizzyd
That's a load of rubbish. Embedding magnets in the wall? Really.
Ssiscool ★
If he can make a six foot escape tunnel, he can scrape out several small holes around the poster's edge, and insert the aforementioned magnets, glued in however he can manage (ie tape, chewing gum).
dizzyd
He could have simply used glue mixed with dirt to weigh it down. Once the glue dried it wouldn't matter how heavy the poster was, so long as there was contact.
How could Andy do that after he escaped through the hole in the wall?
satishsasikumar
I don't think it's what happened, but easily enough. Put magnets in the wall during his tunnel digging process - he had years - then something magnetic affixed to the corners of the poster. As soon as he was in the hole the poster would hang down and affix itself to the bottom corners.
Further, if the poster weren't "glued" on the bottom, it would not have been taught enough for the warden's pebble to go through it. If the poster were attached loosely, the pebble would have simply bounced off.