  In a recent paper \cite{Matz}, Duprey and Matzin investigeated the meaning of
vanishing "weak values" (WV), and their role in the retrodiction of the past of
a pre- and post-selected quantum system in the presence of interference. Here
we argue that any proposition, regarding the WV values, should be understood as
a statement about the probability amplitudes, and revisit some of the
conclusions reached in \cite{Matz}.
