Has anyone else encountered a picture of an iphone that pops up for a few seconds? It seems to only happen when entering a puzzle screen.

There is (or was) a free iPhone app, where you could play the mini games outside of the computer game - and so farm items or solve puzzles, while you are on your way.
Somehow you could connect the app to your game and transfer the results.

I don't have an iPhone, so I never tried it myself.