I was beginning to see a good few threads from us newbies asking questions so thought it might be a good idea to have them all in the one place and any kind who master can answer them for us 
So for a start -
Has there always been little clues left throughout the episodes in other series (eg - Rory's badge, no ducks in the pond) or is this something Moffat has brought in? I don't mean story arcs (crack e.t.c) but more little slight clues which makes people think

So for a start -
Has there always been little clues left throughout the episodes in other series (eg - Rory's badge, no ducks in the pond) or is this something Moffat has brought in? I don't mean story arcs (crack e.t.c) but more little slight clues which makes people think
