May I start by commending the producers for some improvements I have seen recently. I think BB and others have pin-pointed a lot already. Since Vince has given permission for emphasis, mine is as follows:
Please:
-Don't stereotype Actors (A pastor in one movie can be a lawyer in another).
-Match Actors appropriately( I know that this can be subject to availability).
-Eliminate fake accents, It's irritating (Good command of the English Language is what matters).
-Hire professional costumiers and make-up artists.
-Use good sound track(background music/noise should be kept to a minimum).
-Utilize top-notch subtitling editors (example-Igbo, Yoruba and Hausa movies).
-Feature more scenic places. Nigeria is blessed with beautiful mountains, hills, plateaux, valleys etc.

Thank you for your time