This final line was sometimes missing (spoiler)
[Lowell, to Huey, as he prepares to blow up the ship] "You know, when I was a kid, I put a note into a bottle and it had my name and address on it. And then I threw the bottle into the ocean. And I never knew if anybody ever found it."
That line was in it when I first saw SR on television in the 70s, but was missing from the mid-80s VHS release. Does the DVD release have it?
When I saw that it was missing from the VHS release, I guessed that Trumbull had later decided to remove it because Earth, as it was described throughout the movie, may have been so transformed that oceans, at least as we know them, no longer existed.
The ending works with or without it (doesn't take a genius to see the "bottle in the ocean" symbolism), but I had long wondered why it was removed.