Off the top of my head right now:

season 1:
our man in toyland, kaos in control, our man in leotards, my nephew the spy, kisses for kaos, ship of spies

season 2:
the world's greatest spy, casablanca, rub-a-dub-dub...three spies in a tub, it takes one to know one, the man called smart

season 3:
99 loses control, the wax max, Maxwell Smart: Private Spy, viva smart, run robot run, dr. yes

season 4:
snoopy smart vs the red baron, closely watched planes, a tale of two tails, the worst best man, hurray for hollywood, absorb the greek

season 5:
widow often annie, and baby makes four, moonlighting becomes you, and only two ninety-nine, do i hear a vaults