As well as the scene that opens to Pink holding a cigarette in his hand that is burnt to the end. Roger said that he had remembered walking in on a dazed Syd one day with a cigarette like that, I think. Haven't listened to the commentary in a while.

The story is indeed based off certain parts and memories of both of their lives. In particular, 'When the Tigers Broke Free' comes to mind, which was written completely based on Waters father, with a few added details. Very moving song by the way.

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Tired of lying in the sunshine staying home to watch the rain.
You are young and life is long and there is time to kill today.
And then one day you find ten years have got behind you.
No one told you when to run, you missed the starting gun.