There is a thread, it was started last week over in UK General Chit Chat, because many watched it via alternative means. 
http://www.tivocommunity.com/tivo-vb/showthread.php?t=470767
Remember what Idris said to Rory, back in the episode "The Doctor's Wife"? "The only water in the forest is the River"
People's memory isn't exact, like a computer, we store things as associative patterns, so through time the exact words can be lost, leaving us to use words that more match our patterns, for instance: A Song usually contains a Melody, and a Pond contains water, so does a River.
http://www.tivocommunity.com/tivo-vb/showthread.php?t=470767
Remember what Idris said to Rory, back in the episode "The Doctor's Wife"? "The only water in the forest is the River"
People's memory isn't exact, like a computer, we store things as associative patterns, so through time the exact words can be lost, leaving us to use words that more match our patterns, for instance: A Song usually contains a Melody, and a Pond contains water, so does a River.