A picture of Laura Vandervoort from this series was used to make fake ID passports as part of an international identity-theft ring. She was immediately recognized by an FBI agent who happens to be a fan of Smallville (2001) wherein she portrayed Kara Zor-El (Supergirl).
The show was originally going to be set in Los Angeles just as the original mini series had been in 1983. This was changed to New York when the production was moved to Vancouver, British Columbia for tax reasons.
As with the original series, the Visitor's alien text is just a substitution cipher for the alphabet, but written top to bottom then left to right, often breaking words into multiple columns. Many letters have a counterpart rotated 180 degrees, while the glyph for the letter H is already 180-degree symmetric.
Comparisons have been drawn between this series (a reimagining of V (1983), V: The Final Battle (1984), V (1984)) and Battlestar Galactica (2004), another gritty reimagining of a "classic" sci-fi TV series. In the US, the original Battlestar Galactica (1978) aired on ABC, but the new version aired on Sci-Fi (an NBC-owned channel); the original V aired on NBC, but the new version is on ABC. Parallels between the new series even extends to the cast: Rekha Sharma and Michael Trucco are Galactica stars who have appeared in minor roles in "V".
The V stands for visitor (and in the original series it also stood for victory). "5th column" is a well known phrase defined in the dictionary as 'a group of people who clandestinely undermine a larger group such as a nation from within' and has its origins in the Spanish Civil War (1936-1939), when four columns of General Francisco Franco's troops marching towards Madrid were assisted by others from within the city, whom General Franco called his "fifth column" in a radio address. (However, the term is misused in this series as it seems to be a generic synonym for resistance or insurgency. Ironically, the population of undercover sleeper Visitors who lived on Earth for years in preparation for the Mother Ships' arrival, often as FBI agents, would be a much better candidate for the name 5th column.)