They're called prop bets. Bets that don't have anything to do with the game itself but are things around the game.
For example this site allows you to bet on if J Lo will show butt cleavage during her performance. Then they have a definition of what butt cleavage is.
Bovada allows you to place all kinds of prop bets!
WILL DEMI LOVATO BE WEARING A SKIRT, DRESS OR GOWN TO SING THE US NATIONAL ANTHEM?
HOW MANY TIMES WILL THE PATRIOTS 28-3 COMEBACK BE MENTIONED?
Who will the Super Bowl MVP mention first in his speech?
Teammates, God, Jesus, Family, Owner or City.