Corrected entry: After Andy has escaped, we see a shot of his and the neighbouring cells. There simply is no room for any hollow wall between the cells - which is the wall where the poster is hanging. The basic premise of the movie does not hold.
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Correction: Andy is not escaping through a 'hollow wall'. His cell is on the end of the row and the wall where the poster is hanging is on the other side of piping, etc.
Zaphod Beeblebrox