Question: When Frank is delivering books to inmates' cells, he reaches D block, but a guard stops him, and tells him they are not allowed in those cells. Were books really disallowed in D block cells?
Answer: Those were the solitary confinement cells, with no light and no luxuries of any kind. So yes, they did not allow inmates on that block to have books.
This is inaccurate as a light in each cell was turned on at 6:30 every morning in solitary confinement at Alcatraz.
Question: Instead of trying to murder them, why didn't the Lizzies simply contact the Riffs and tell them they had 3 of the warriors and to come get them? They had plenty of time.
Answer: The Riffs had put out a hit on the Warriors via the radio DJ, meaning that it didn't matter if the Warriors were taken alive or not; the Lizzies probably figured it would be easier simply to kill the Warriors and collect the reward.
Answer: Yes.