This is Madeleine Albright's second cameo in "Madam Secretary" after "The Doability Doctrine" from season 2.
This episode seems to have been taken down by Amazon Prime India, due to its references to Hindu nationalism and Hindu extremists. The episode, titled 'E Pluribus Unum' is tagged as 'video currently unavailable' while the other episodes are available for playing.
This is Hillary Clinton's second cameo in CBS 2018 autumn season after appearing in reboot of "Murphy Brown" where she wanted to become Murphy's personal secretary.
Sakina Jaffrey, who played Indian Foreign Minister Chondita Samant in this episode, previously played the president's Chief of Staff in the Netflix show House of Cards.
E Pluribus Unum has never been the national motto of the United States. It appears on the great seal but they didn't have a national motto until 1956 when In God We Trust was made their national motto. In God We Trust has appeared on their coinage since 1863 when it appeared on the nickel.