Inspired by the recent "Name that Movie" puzzles, here is something similar. I will be giving away too much information if I tell you the subject, so you will have to work that out yourself. Once you get the first one, the rest should come easy.
A small apple
The Godfather is the key to his puppy's toy
Max's partner won 100m sprint for USA
An Italian PhD
Jerry's nemesis reading an eBook
What is the (specific) common theme?
They are not movies.