  The expressions for the overall effect of Pauli blocking in quasielastic (QE)
lepton scattering from nuclear targets within the framework of the Relativistic
Fermi Gas (RFG) given in several publications are incorrect. For example, the
expressions published by Bell and Llewelyn Smith in 1972 are incorrect
(probably a typographical error). The expressions for Pauli blocking presented
in several subsequent publications including the paper of C.H. Llewelyn Smith
in 1972 and the paper of Paschos and Yu in 2002 have the same error. Another
example is a 1992 paper by Singh and Oset which has a different (probably also
a typographical) error. Other papers such as the papers of Tsai in 1974 and
Bosted and Mamyan in 2012 use the correct expressions. In this short preprint
we review the geometrical derivation of the overall reduction of the QE cross
sections due to Pauli blocking for electron and neutrino scattering for targets
with equal numbers of neutrons and protons and for targets with unequal numbers
of neutrons and protons and derive the correct expressions. However, we note
that the effects of Pauli blocking within the framework of the RFG model are
much larger than in other more realistic models of QE scattering such as
$\psi^\prime$ superscaling or a spectral function approach.
