  The quantum eraser variant of the double-slit experiment, and its 'delayed
choice' sub-variant, are considered from the perspective of weak value and weak
measurement theory (which is briefly reintroduced here). The interference
fringes that appear when measuring certain spin states, which can then be
'erased' when measuring other spin states, are shown to be anomalous weak
values that depend on particular post-selection choices. By framing the choice
of spin measurement as a weak value of a certain weak measurement, it is then
made clear what physical claims can and cannot be made about what occurs in the
quantum eraser experiment. Specifically, claims about the choice of spin-state
`retrocausally' influencing the choice of slit(s) for the particles to travel
through are discredited, and a simple framework is presented for understanding
how the fringes arise and why they can be 'erased'.
