Mad Men is a show that prides itself on getting even the most of obscure of its period references exactly right, but Sunday's episode made a glaring anachronistic gaffe.
In the episode, Joan Holloway (Christina Hendricks) is paid a visit by her old friend Kate (Marley Shelton), and offers to make reservations at Le Cirque, the legendary Manhattan dining institution founded in 1974 by Sirio Maccioni.
One problem: The show is currently set in 1968.
"Sirio would have been open if he knew that Joan wanted a reservation in 1968," Cirque publicist Jean Lee tells The Hollywood Reporter, adding that Maccioni, 78, "loves beautiful women, that time and that period."
The timeline error isn't the show's first, but is arguably its most egregious.
The show's obsessive viewership have made something of a spectator sport of identifying such oversights. Even NBC Nightly News anchor Brian Williams has joined in, once pointed out on his blog that an NFL game wouldn't have aired in primetime in 1964.