  Upon reading Einstein's views on quantum incompleteness in publications or in
his correspondence after 1935 (the EPR paradox), one gets a very intense
feeling of deja-vu. Einstein presents a quantum hole argument, which somewhat
reminds of the hole argument in his 1914 "Entwurf" theory of general
relativity. PBR write in their paper, "An important step towards the derivation
of our result is the idea that the quantum state is physical if distinct
quantum states correspond to non-overlapping distributions for [physical
states]". PBR then conclude, "The general notion that two distinct quantum
states may describe the same state of reality, however, has a long history. For
example, in a letter to Schr\"odinger containing a variant of the famous EPR
(Einstein-Podolsky-Rosen) argument", and they refer to Einstein's quantum hole
argument. This short paper discusses the PBR theorem, and the connection
between the PBR argument and Einstein's argument and solution.
