The new DIckstarter task to custimize movie covers can be completed with any single change paid for by bills (and/or presumably diamonds). I only spent bills, someone else can try spending 5 diamonds to let us know. Simply changing your outfit and saving the new cover does not count, even though you have to click change cover to make it perm. (I tested this). The credit does happen once the change is made, not when the movie is finished. And you DO NOT get additional credit for changing the same move cover again. (also tested.)
I don't know if changing the title counts. Hope this helps!
Edited by Tabithia, 01 March 2019 - 10:00 AM.