After the ending plays, there are several things that will happen if the game is left running, and it's possible to trigger a hidden message from one of the developers. First, the ending photo will change to black and white, and then sepia. The music will then stop, and inputting several button combinations on the two controllers will play Hidemushi's messages, calling out everyone that he had to put up with while developing the game, before going on to thank both those who did help and his wife.
Contributed by gamemaster1991