What basic things I should look into while writing the last 15 minutes of a film?
The last 15 minutes of a film usually involve a wrap up. What this means is that you should address an issue that was brought up earlier in the film, hopefully in Act 1, but left unresolved. You should also try to show that the events that happened to the character in Act 2 have changed the protagonist in some way. (better or worse). This doesnt mean you have to end it happy or wrap everything up in a nice bundle. You can also raise more questions for a sequel or leave it so the audience must decide what they think the character does after the film ended.