In this paper we study two separate problems on interpolation. We first give
a new proof of Stout's Theorem on necessary and sufficient conditions for a
sequence of points to be an interpolating sequence for the multiplier algebra
and for an associated Hilbert space. We next turn our attention to the question
of interpolation for reproducing kernel Hilbert spaces on the polydisc and
provide a collection of equivalent statements about when it is possible to
interpolation in the Schur-Agler class of the associated reproducing kernel
Hilbert space.