  In this paper we study two separate problems on interpolation. We first give
some new equivalences of Stout's Theorem on necessary and sufficient conditions
for a sequence of points to be an interpolating sequence on a finite open
Riemann surface. 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.
