Here is short list of 5 obvious indicators:

1) When you have over 75 .c (lite c) files and 10 dlls.
2) When you started the game you was using A6, now converted twice and using A8.
3) 4 ex-Disney stars when you started have gone crazy, many into soft porn.
4) Everytime you do a mulitplayer test, Blizzard sends you a message that your WoW account security has been comprimised.
5) People you have previously hired from the 3DGS forums as temporary help have now completed 1 or more of their own games.

Much in jest, but not all.