Get Smart S04E07 - A Tale of Two Tails

Max fills in at spy school for an afternoon and is forced to deal with two students whose grades are "alarming in disarming and failing in tailing." After a brief disarming session, he assigns 198 and 199 to 99 as she picks up wedding items. Unknown to Max, 99 is also on assignment and is really picking up the Gaul Formula. She spots the tails and believes them to be KAOS agents.