I totally forgot that Nincada was Ground/Bug the other day. I always thought that it was pure Bug and its evolutions had dual typing. I definitely remember Ninjask and Shedinja's typings, but totally forgot about Nincada being dual typed also.
Another one that use to through me off was Lugia. I use to think it was Water/Flying instead of Psychic/Flying.
Other than that, I am probably familiar with every type except for some of the Fairy-types like Granbull and the new Kalos ones.