Erica Rogers plays the fiance of a friend of Simon Templar. In episode 6 of the same season (The Pearls of Peace) she played the fiance of a different friend of his.
Right after Simon gives her the flat sandals and she throws her white heels down the hill; the next scene shows them walking on a road and she's hobbling along in the heels again. Which look higher than her original ones.
First episode based on a Saint story by his creator, Leslie Charteris.
Season One episodes The Pearls of Peace and The Golden Journey share the same guest star (Erica Rogers), as well as two sets: the village square/Hotel Perla exterior, and the bar/cantina. Certainly both episodes were filmed during the same session.