the player can cheat under certain conditions; if there is only one tile left on a row, the player can flag it and if it is a mine, the row will clear. if not, the player can unflag it and click it. not sure how big a deal this is really.
the game adds too many rows and then deletes the extra rows, instead of just adding the correct number of rows in the first place. this is due to the row clearing method nesting and adding the new rows several times as a result
the scoring system is wrong due to the above problem; if any tiles cascade during removal of rows, the score is added again for each step of the cascade leading to vastly inflated scores