Claire is...

MAD MEN

According to Jon Hamm, the production's pursuit of historical accuracy is such that series researchers will insist on knowing weather conditions, news items, and popular culture for a particular period related to the script's time frame.

The actors do not smoke real cigarettes. They smoke Ecstacy herbal cigarettes, which are tobacco and nicotine free. Show creator Matthew Hoffman Weiner said in a New York Times article, "You don't want actors smoking real cigarettes. They get agitated and nervous. I've been on sets where people throw up, they've smoked so much." When asked what it's like to smoke herbal cigarettes, Jon Hamm (who plays Don Draper) told Vulture, "Terrible. They taste like a mixture between pot and soap."

About a year elapsed between the filming of the pilot, Mad Men: Smoke Gets in Your Eyes (2007) and the second episode, Mad Men: Ladies Room (2007).

At a 2013 Q&A session at the Paley Center for Media, Matthew Weiner said that he had already told his wife and a few writers about how he plans to end the whole series. He also said that "he's been told it's a disaster, but he's going with it [anyway]."

Jon Hamm is the only actor to appear in every episode.

Glen, the neighbor's young son who forms a connection with Betty, is portrayed by Marten Holden Weiner, the son of series creator Matthew Hoffman Weiner.

John Slattery auditioned for the role of Don Draper before being asked to play Roger Sterling.

In 2012, costume designer Janie Bryant told Slate magazine that she always repeats one of Peggy's costumes from the previous season during the next season's premiere. Bryant said that she "[loves] that tradition for Peggy because I think that this all is really based in reality. That's what we would do in real life: We repeat our clothes."

On March 23rd, 2015 Jon Hamm released a statement admitting that he, like his character of Don Draper, had developed an alcohol addiction, and he had just completed a 30 day rehabilitation.

Julia Ormond, who guest-stars as Marie Calvet, was such an ardent fan of the show that she once ended a long-term relationship with someone when he watched a new episode of Mad Men without her.

The little ball-shaped glasses often used by Draper and colleagues are a design known since at least the 1950s as "roly poly" tumblers. The band of metal plating along the rim, an innovative accent introduced by artist Dorothy Carpenter Thorpe, made the design even more popular (and much-copied) through the 1960s and beyond. Sets of these made ideal business gifts, as the bands (made of silver, chrome, platinum, or even gold) could be custom-stenciled with initials, company logos or other business-related graphics. Draper's glasses appear to have platinum bands.

Creator Matthew Weiner directed every season's finale, all the way up to the series finale.