The grown-ups just never learn: you cannot leave David or Amy alone ever while Quentin still exists.
I love the part where Barnabas thinks about being chained in his coffin while Quentin lived the whole of his life. It's hard to imagine - Quentin as a baby, as a child, as a young man at Collinwood - and all the while, Barnabas was in his coffin, suffering through the nights, not knowing anything of what was happening in the outside world.
What sort of stories does Willie tell? When Amy said Willie was in the kitchen, I thought she was going to suggest that they see if he would give them something to eat. I'm imagining Willie telling fantastical stories about the adventures of Jason McGuire - taking his memories of Jason, and adding to them, and turning Jason into a Robin Hood type, stealing from the rich and giving to the poor and being far more successful at the stealing than Jason McGuire ever was in his life. (Note: Robservations says Amy suggested they go have Maggie tell them a story. I'm quite sure that Amy said Willie, not Maggie.)