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