From Smooth Moves, the fact that Jimmy P. and Jimmy T. are both animal lovers.
Also the end of Jimmy T's stage.
9-Volt and 18-Volt's stage in Smooth Moves. After getting kicked out of the house by 9-Volt for breaking his Game and Watch system, 18-Volt desperately searches for a new one. In the end, 9-Volt ends up meeting 18-Volt grabbing onto the same Game and Watch system, forgiving him with a nice, "You'll always be my Player 2!"
In Game & Wario, 9-Volt says his mom seems pretty scary, but she's actually "pretty cool".