When i run standalone, the textures seem to be blurry until you get close to them.
In blender player (by pressing p) everything is fine. I tried disabling mip maps and it does nothing.
I also boosted AF to 16x and still nothing. I gotta video uploading for reference.
I’ve gotten this too, it is a result of map mapping but disabling it causes flickering in distanced textures. There’s supposed to be an option for smoother transitions but it doesn’t seem to work properly in the standalone player, anisotropic filtering doesn’t work properly in standalone either I’ve noticed 
How did you scale your objects?
if in edit mode, then i got nothing to say.
Else select object hit alt+s, and scale it in edit mode, see if that works. It can be due to the scaling isn’t 1:1 so the textures can be blurry(stretched in a way).
or are you using a DoF filter?