* CaliforniaDoubling:
** Charlotte, North Carolina, doubles as DC and Northern Virginia. That is why so many cars lack front-mounted plates; NC does not require it.
** Tel Aviv doubles as Beirut in the first two eps of Season 2, as one of the show's exec producers is Israeli and barred from Lebanon as a result. The Lebanese government were not happy about the latter's portrayal.
** Cape Town, South Africa doubles as Islamabad and rural Pakistan in Season 4.
* ContentLeak: An unfinished version of the Season 3 premiere was leaked roughly a month before it aired.
* TheDanza: Creator/DavidHarewood plays David Estes.
* DawsonCasting: Morena Baccarin, 31 at the time of filming, has a 16-year-old daughter in the show. She's supposed to be around the same age as Brody, who is played by the 40 year-old Creator/DamianLewis.
* EnforcedMethodActing: The goodbye letter from Peter Quinn that Carrie reads in Season 5 was drafted by Rupert Friend himself on the showrunner's request. Claire Danes's reaction to said letter was genuine, and the producers loved it so much that [[spoiler:they decided not to kill him off that season]].
* FakeAmerican: Creator/DamianLewis, a Brit, as Sergeant Brody. Creator/DavidHarewood, another Brit, as Estes. Creator/RupertFriend, yet another Brit, as Quinn.
* FakeNationality: Creator/SurajSharma and Nimrat Kaur[[note]]In a cruel irony given that her character plays a Pakistani ISI agent who aids the Taliban, her father was killed by a Pakistani-supported Kashmiri militant group.[[/note]] are Indian and Shavani Seth is a Brit of Afro- and Indo-Caribbean descent, all playing Pakistanis.
* NonIndicativeTitle: Despite the title, the series is about the CIA, not the Department of Homeland Security.
* PlayingAgainstType: Creator/MelissaBenoist, an actress associated with goody two shoes roles on ''Series/{{Glee}}'' and ''Series/{{Supergirl|2015}}'' makes an early career appearance as a wanton party girl having a naked audition to be part of a sheikh's harem.
* RealLifeRelative: Star Claire Danes' husband Creator/HughDancy plays John Zabel.
* WhatCouldHaveBeen:
** Brody [[spoiler:was initially supposed to die at the end of the season, but Damian Lewis' performance was so good the ending was rewritten.]]
** Laura Fraser, also known as [[Series/BreakingBad Lydia Rodarte-Quayle]], was originally cast as Jessica before replaced by Morena Baccarin.
** [[spoiler:Peter Quinn was supposed to die in the Season 5 finale, but the producers were so touched by Rupert Friend's goodbye letter to Carrie that they brought him back for Season 6]].
* WritingByTheSeatOfYourPants: The writers came up with the ending a day before filming started. They couldn't settle on a good reason for Carrie to stay in Moscow until the day before, when they decided that she should be writing an expose of the CIA.
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