Notes about this app poster:
The top section includes all important screens that show the concept of the app.
The UI elements, typography, etc section is done really nicely. They pulled out major elements of the UI design and featured them in that section rather than trying to focus on those elements with a whole screen mockup.
As you move through, they place unimportant screens with more important screens. This way, they don't have to dedicate a whole section to the unimportant screens.
I think the "some more screens" section is ineffective. There are some screens in there that definitely should've been featured in their own section. "Some more screens," isn't a good title, either. It doesn't describe anything. It's like having a portfolio collection titled, "other." Nobody's going to look at that. You've practically labeled it, "not important" at that point.