"If Doctor Who were a musical, Rory would be that one non-musical character who doesn’t get why everyone is singing all the time and is constantly confused by it." <--------I pinned this just for the comment
River also made a comment about the TARDIS light, and asking the Doctor if it needed to be changed. (which he had just recently done). It's like the Christmas references. Never ignore a coincidence. Unless you're busy, then always ignore a coincidence.