- For video release in the mid-1980s, an additional episode of this series was created, consisting of a one-on-one interview between Carl Sagan and media mogul Ted Turner, discussing the themes of the series.
- Reissues of the series feature different music than on the original broadcast, due to licensing issues.
- For the German version, all episodes were cut down to ca. 43 minutes to fit into the programming schedule of public broadcaster ZDF.
- In 1991, Sagan taped new introductions and afterwords to mark the show's 10th anniversary. These new segments allowed him to update and correct information presented in the series.
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