I found this website today called 'Answers INC', which lists all the previous answers to quiz's and games featured on ITV Play's 'The Mint', so that you can check to see if your answer has already been said before you phone up to play. You can view 'Answers INC' at http://www.goldstag.co.uk/clients/answersINC/default.asp.
Also, instead of paying 75p each time you phone up to enter a 'The Mint' game, you can enter free online at http://themint.eckoh.com/index.php.
Source - http://forum.digitalspy.co.uk/board/showthread.php?t=360273&page=115&pp=25.