Was Barbara Feldon NOT in?

according to IMDB.com Barbara was in every episode of Get Smart.

seven- Survival of the Fattest, The Day Smart Turned Chicken, When Good Fellows Get Together, The Mummy, The Girl from KAOS, It Takes One to Know One, and Cutback at Control- the last 4 were almost consecutive- Feldon appeared in the feature Fitzwilly in 1967, maybe she took time off the show to work on that film?

Ed Platt wasn't in 10 shows- including When Good Fellows Get Together and 5 others in season 3, when he had back trouble.

Don Adams called out "sick" for Ice Station Seigfreid- although since he was contractually obligated to be in every episode, he appears briefly and says two sentences in the very beginning.