Thirty second periods:
Hold A + C and press Start on the select screen.

Bonus players:
Hold A + C and press Start at the player selection screen.

Super players:
Create a player and select any position except for goalie. Set all attributes to "79", except "Checking" or "Aggression" which should be "56", and one other attribute which should be set to "78". A player rated at "99" will be created after the he is selected for a team.