Norman Grant (James Garner) was a Republican senator in the book upon which this was based, but the character's political affiliation, along with other factors, were changed to suit Garner's personal (Democratic) politics.
When the Saturn V rocket is shown on the launch pad for Apollo 18, the scene changes between shots from a Saturn V to a Saturn IB.
Three versions exist. The original (1985) is 13 hours long and aired from Sunday-Thursday. (Alternated 2 and 3 hour episodes.) In July, 1987, CBS rebroadcast it every Saturday night, using a re-edited 9 hour version (Three 2's and a 3). In 1989, it hit syndication and was shown in a ten hour version. (You guessed it, 5 two hours.)