We propose to study what shall be termed critical nodes for a family of Linear Quadratic Gaussian Graphon Mean Field Games (LQG-GMFG). The critical nodes are defined to be those nodes at which the local mean field is stationary with respect to its index. We present examples of such nodes for the graphons that are the limits of (i) uniform attachment graph and (ii) the Erdos-Renyi graphs. We also investigate the properties of these critical nodes on the value functions and the equilibrium startegies for the LQG-GMFG.