raywest

Question: Andy Duframe was in prison for 20+ years, received his rock hammer early on and realised he could chip away at the wall. In 20+ years, every cell check, no one bothered to look behind that poster covering that hole. In that time, not one guard walked past during their checkups and accidentally saw him chip away at the wall, not to mention the buildup of whatever that wall is built of is scattered throughout the yard. After 20 years, that would be a fair buildup. Did no guard or prisoner ever question this?

oobs

Answer: Andy got special treatment due to helping the warden, so his cell wasn't closely inspected. No one suspected he was digging a tunnel, and it would be impossible to hide contraband behind a poster, so no one thought to look behind it. His cell was on a corner, so he could see and hear the guards coming. As for 'buildup of debris,' it was about four cinderblocks' worth of rubble in that huge yard, with a lot of foot traffic, over twenty years.

Brian Katcher

Answer: Real-life jail breaks have been more elaborate and unbelievable than what is depicted in this movie. Digging tunnels to escape is not uncommon, which he didn't, only through the wall. Recently, in 2015, a man in Mexico escaped prison by digging a tunnel from his prison cell to a construction site over 1.5 kilometres away; the tunnel was dug 10 metres underground. Now, he obviously had a lot of help from guards or from outside (cartel) with handling material to him and away from his cell, but still, it's quite impressive. He had a makeshift motorcycle for inside the tunnel to transport materials with and managed to evade capture for a year.

lionhead

Answer: Apparently no-one noticed, which, as you pointed out, is highly implausible. I don't entirely disagree with the other answers, but this seems more like a plot hole mistake.

raywest

Question: How did the inmates on rooftops manage to get their hands on beer?

Answer: It was given to them by the guards.

lionhead

But isn't beer banned in prisons?

Guards can be bribed to bring in contraband.

raywest

Part of Andy's agreement with Hadley for helping him with his taxes is that the prisoners working on the roof are given some beer as a reward.

Phaneron

Andy gives Hadley (the head guard) financial advice on how to keep a large sum of money, which he (Hadley) received as an inheritance. Andy, being an accountant, offers to do all the necessary tax work, in exchange for three beers apiece for his fellow inmates. Hadley agrees, and arranges for the beer to be delivered and given to them. (All of this is shown in the scene immediately prior to that in which the inmates are drinking beer).

Answer: Under all but rare circumstances, alcoholic beverages are not allowed in US prisons, which was also the case in 1949, when this scene takes place; the significance of this scene is to establish that Andy began to enjoy special privileges while incarcerated, which is also how he eventually got the warden to allow him to establish the prison library.

zendaddy621