To unlock the following items, you must accomplish the feat shown in the Train With Beckham Mode, using the Professional Player Certificate. 

Unlock Edit Player: Score five goals in "Free Play"
Manchester Eleven Team: Score at least 20 points in "Target Free Kicks"
World All-Stars Team: Score at least 20 points in "Target Passing"
England Eleven Team: Score at least 20 points in "Target Crossing" 

Classic Match Games:
Score at least 15 points in the "Target Shooting." Then select the "Classic Match" option in arcade mode to access the American Samoa vs. Australia, Brazil vs. Italy, Calais vs. Nantes, Manchester vs. Munich Whites, Manchester vs. Leeds and Italy vs. England games. 

Bonus Stadiums:
Complete "Panel Bash" in under ten seconds. Select the "Game Settings" option in Friendly Series mode to access the Aztec Arena and Bouncy Castle stadiums.