Ninja Gaiden/Fridge

Fridge Horror

 * In case you haven't noticed, in the infamous continue screen for the Arcade game, just before the screen fades to red, if you pay attention you can see, as a Freeze-Frame Bonus, that the circular saw has started moving. Yeah. One can only wonder what the fade-to-red stands for.

Fridge Logic

 * The recent Flip-Flop of God regarding the chronological order of the games leads to this. He beginning of the first Xbox game features Ryu in traditional ninja apparel, but after Hayabusa village is attacked, he switches to his modern gear and sticks to it whenever he needs to go on a mission or save the world. Yet in the NES games and the OVA, which have been confirmed by Word of God to take place after the Xbox games, he's back to wearing more traditional armor again.