You probably did. The worst of them would never have been aired on TV, or would have been carved up so thoroughly you never would have known what was missing. I recall that at least one "missing" Bugs cartoon involved blackface singers (including Elmer Fudd, if my memory does not betray me). I have not seen Warner Brothers' "lecture you before letting you watch the cartoons" DVD releases, but someone who has could fill you in much better.