The first episode of 24 had an airplane exploding heavily edited before broadcast since the episode was to be aired less than two months after 9/11. The original version, to my knowledge, was never shown.
There's one episode of Voyage to the Bottom of the Sea that looks like a portion was sliced for whatever reason and remains this way on the DVDs.
"The Lobster Man" - the alien of the title is on the Seaview and follows Nelson and Crane into the radio shack so Sparks can place a call regarding...