Since the newest update, there are a lot of players who have been facing the graphic bug problem in Clash of Clans.
You can see this terrible problem while moving your game screen. Here are some screenshots of it:
Not just Samsung users but also HTC, Sony and other users have been facing this terrible one. After couples of hours searching on Internet, I have just noticed that this problem is just only on Android 5.0.2. It means you need to follow these steps to fix it:
Backup your Clash of Clans account first. You can read more about it at this tutorial.
Downgrade your phone to 5.0.1 or 5.0.
Sad but that is the only way to fix it now. I hope Supercell can release the new update for 5.0.2 users near future.