Hmm I'm might be getting this wrong but I don't see a flashing as such. The whole view changed colour instantly then animates, the colour changing might look like a flash to some people but not to me, it's just a colour change. So depending on ones point of view, I would say that it's not flashing but just changing colour quickly only N5 and S4 devices.
Not unless you are actually seeing the view flash off and then back on again, but I'm not seeing that either...