“There’s something coming up in the final days of the Ponds that was in The Eleventh Hour” - Matt Smith

The possibilities: 

1. A drawing in Amy’s bedroom shows her/a house on fire.
2. When Amy starts to pack, the door of the perception filtered room is opened.
3. A man runs past a clock when Amy is waiting outside for the Doctor.
4. Amy’s house has two stories, but there’s another flight of stairs on the second floor.
5. When the Doctor’s “reset virus” is activated, shots of a big city are shown. One of the shots has a stone angel in it.
6. Mrs. Angelo’s broach is identical to River’s in The Big Bang.