In Daredevil, The New York Bulletin is featured quite prominently, and it was first introduced in Agent Carter Season 1.
In Daredevil Season 3, Wilson Fisk sought to forcibly recruit the Maggia crime syndicate for an extortion ring through his control of the FBI's New York Crime Division. This crime syndicate made its first appearance in Agent Carter Season 2.
The Red Room was introduced in Agent Carter Season 1, and later depicted in Avengers: Age Of Ultron.
In Captain America: Civil War, Helmut Zemo uses the Faustus Method, created by Johann Fennhoff (Doctor Faustus) as seen in Agent Carter Season 1, to control Bucky Barnes.
In Doctor Strange, the Dark Dimension, from which the Darkforce seen in Agent Carter Season 2 comes from, is introduced.
A variant of Edwin Jarvis appears in Avengers: Endgame, played by James D'Arcy, who played Jarvis in Agent Carter.
In Peter's To-Do List (a compilation of canon deleted scenes from Spider-Man: Far From Home), Peter Parker fights the Manfredi Crime Family, who were first introduced in Agent Carter Season 2.
James D'Arcy reprises his role as Edwin Jarvis in What If...? Season 3 Episode 2.
What If...? Season 3 Episode 2 also sees a version of Howard Stark's film studio, which was first established in Agent Carter Season 2.
In She-Hulk: Attorney At Law, the law firm, GLK&H is featured, and it was first mentioned in Agent Carter Season 1.
O'Harran's Scotch Whiskey, previously seen in Agent Carter, was seen in Daredevil: Born Again.
James D'Arcy is set to play the human form of J.A.R.V.I.S. in Vision Quest.