Yu-Gi-Oh! VRAINS/Fridge

Fridge Brilliance

 * During the Knights of Hanoi attack on the Cyberse, they imprisoned all of the AIs except for Ignis. Each of the AIs has a distinct look and color, red, yellow, orange, blue, green, and purple (Ignis). At first this seems to be an easy way to tell them apart... until you remember that Monsters in the Duel Monsters game (with the exception of the Egyptian God Cards) are one of six attributes, with each attribute associated with a color: DARK (purple), EARTH (orange), FIRE (red), LIGHT (yellow), WATER (blue), and WIND (green). Ignis' comment on how the other AIs don't like him suddenly makes a little more sense.
 * Duels during data storms being restricted to Speed Duels could be because the systems can't handle Master Duels when it's currently being flooded with an influx of data, making Speed Duels all the system can handle.

Fridge Horror

 * When Ignis disconnected the Cyberse from the rest of the network, what happened to the other AIs that were trapped?
 * Yusaku no longer enjoys dueling and mostly uses it as a weapon to fight the Knights of Hanoi. He's exactly the kind of person who needs the help of the previous protagonist, Yuya, the most and yet, will never meet him outside of non-canon specials.