Enter the "Rosters" screen and select the "Create Custom Team" option. Then, enter one of the following locations and team names to activate the corresponding team that consists of members of the development staff.
Fake pass
While playing a game, press L2 + X.
Play as a Gorilla
Go to the "Create Player" screen and enter "BIG BOY" as a name. Then, enter Charles Barkley's attributes for the player. The Gorilla should now appear in the free agents list.