In a massive media campaign before the series aired, posters with the line "The Visitors Are Our Friends" appeared in subways around the United States - just as they did in the first part of the mini-series. Days before the first episode aired, each poster was spray-painted with a bright red "V" exactly as was done in the show.
On 30 October 1982, Dominique Dunne, who had been signed to play the role of Robin Maxwell, was at her house with co-star David Packer going over lines for the next day's filming, when her boyfriend John Sweeny arrived unexpectedly and throttled Dunne into a coma. Five Days later, on 4 November 1982, Dunne died. Blair Tefkin was cast to replace Dunne as Robin and all of the scenes that had been shot with the late actress were re-filmed. According to the DVD commentary, however, Dunne is still visible from the back in one group scene that occurs as the Visitors arrive on earth.
The series was intended as a literal retelling of the Nazi takeover of German and the resistance movement against it. However, because of the popularity of Star Wars: Episode IV - A New Hope (1977), as well as the belief among network execs that the US citizens would not believe a fascist takeover, the network execs had the producers change it to a science fiction mini-series. Other ideas were also discussed but discarded.
The music that plays when the ship is first seen has as a major motif consisting of three short notes followed by one long note. This is the letter V in Morse code. It is also patterned after Ludwig van Beethoven's fifth symphony
Due to the high cost of the laser special effects, it was decided that human resistance fighters would use regular rifles and pistols. This was explained away in the script as due to high security on the alien armories.
The octagonal storage containers a device with what appear to be rotating red lasers inside a long glass tube, both of which are seen on the Visitors' mother ship, later made regular appearances as set dressing and props on Star Trek: The Next Generation (1987) and other series.
The company the resistance members steal medical equipment from is called Stamos Pharmaceuticals. Writer-producer-director Kenneth Johnson named it after actor John Stamos, on whom his daughter had a crush.
Much of the non-original music for the filming of V was a combination of motifs from Richard Wagner's "Ride of the Valkyries" and, more notably, motifs from the fourth movement of 'Ludwig Van Beethoven''s 5th Symphony.
The music during the closing credits was a combination of most, if not all, motifs of the 4th movement of Ludwig van Beethoven's 5th Symphony closing with the final couple of measures of the 4th movement of Beethoven's 7th Symphony. According to Kenneth Johnson's DVD commentary, the lyrics to Beethoven's music were added with some self-admitted outrageous chutzpah and were the following translated into Latin: glory to the cause, glory to the fallen, glory to the fighters for freedom, victoria...victoria, for victory!