msycamore said:
The most obvious homage to Herrman's Psycho, is the 3-note motif Williams used for the scene where our heroes emerge from the Millennium Falcon's secret compartments.
Film Score Monthly Vol 8 - 1 (Williams interview)
I personally have no problem believing this as the figure in question is such an elementary musical idea which I'm sure could be traced back to a couple of hundred years before even Herrmann.