Sega Sports team
Enter the "Options" screen and choose the "Codes" selection. Enter "SUPERSTARS" as a cheat code. Note: The code is case-sensitive. Then the Sega Sports team will be available at the team selection screen between the NFL All-Pros and 49ers.
Turbo mode
Enter the "Options" screen and choose the "Codes" selection. Enter "TURBO" as a cheat code. Note: The code is case-sensitive. Then, choose the "Game Options" selection, highlight "Game Speed" and change the speed to "Turbo".
Glitch in Player Creation
Create a wide receiver with full arm and leg scale. Display the attributes page by pressing Start. Under Receiver Type, select Speed Receiver and set the following to get a strange object at the top:
100
80
90
78
72
72
90
90