During the development of DOA2 Itagaki was asked by Tecmo’s general manager of sales if he could “borrow a copy of this so [he could] play it a little?” This disc wasn’t intended for a little play, it was intended for the pressing plant – the in development disc became the released game.
Following this Itagaki turned to drinking, adding “I thought I would quit making games.” Eventually Itagaki recovered and released the revamped version of the game.
Thanks to Siliconera for the info.