To help remember the dative prepositions, sing them to the first two lines of the Christmas carol Good King Wenceslas. Remember that King Wenceslas first set out on the ‘date’ (= dative) of the feast ...
Cut! Look at the script: the accusative preposition 'für' makes 'der Film' become 'den Film'. 'Die' and 'das' do not change in the accusative. So, 'für die Karten', and 'für das Kino' – no change, see ...