Some eventual aspects of scale effect manifestation in nanoindentation experiments for nanostructural elastomer composites are discussed in frame of physical conceptions of anharmoniszm and density fluctuation. Scale effect is analyzed according to variation of dependencies of elastic modulus vs. deformation value. In particular, it was shown, a transition from nano- to microdeformation (or from nano- to microindentation) is observed, when a volume of strained material during experiment will exceed a cumulative volume of two aggregates of nanofiller, which locate into polymer media.