Bugs and cheats listed below can be replicated on a device without the need of cheat tools.
If you go into "Upgrade Facility" and click on the name of a facility that you have fully upgraded, you will see the untranslated word 了解 (ryoukai). The word appears to mean something like "I understand" or perhaps "Okay", but by convention the English word that would normally go here would be "Back" or "Close".
In the PL Story (English version), after a match, your team will go back to your stadium for training. Then when you trying resize the screen (by touching the screen with your 2 fingers) then go around, the game will be crash.
During special practice, you may train 3 players. Even you have dismiss (or 'sack') the player from the team but there are still on special practice there until you remove them from special practice selection.