I'm facing this issue as well, building app on Android platform and also using Cardboard SDK. Hoping some Unity experts can answer this question.
[Updated]
In my case, this 2-fingers-multi-touch-detected issue only happen when you switch from cardboard scene to non-cardboard scene.
My Solution is: When you want to load scene from Cardboard scene to non-Cardboard scene, before you execute LoadLevel( ), disable the **VR Mode Enabled** in **CarboardMain** game object, under **Cardboard.cs** script, then you execute LoadLevel( ).
ps: When you turn off **VR Mode Enabled**, you will experience Cardboard cameras change from VR mode to non-VR **in a second**, before you completely jump to the LoadLevel( ) new scene. This is ugly.
AND the solution is,
**You can overcome this by disable the camera first, then only you turn off the **VR Mode Enabled** in CardboardMain game object, so the scenes-switching flow will be appeared smooth.**
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