In the car scene, Darlene (Carly Chaikin) asks Elliot (Rami Malek), "What's your damage?". This is a famous line from Heathers (1988) that Christian Slater starred in.
If you go to "e-corp-usa.com" it will actually load up the E Corp website along with a server down message.
When Angela (Portia Doubleday) is logging back in to re-start the WiFi the password she's given to type is "Joshua" - this was the "backdoor" password to the WOPR computer in WarGames (1983).
Elliot (Rami Malek)'s '80s sitcom dream comes complete with network bumpers and logos from that era, a vintage Bud Light commercial, and E Corp ads as they would have looked back then.
For the sitcom sequence in the second season, creator Sam Esmail and his crew researched and consulted with other crew members who worked on 80's/90's multicamera sitcoms, as well as learning how to film an episode in that format. For authenticity, Beta tapes and cameras were used to film the sequence.