Spoiler:In the junkyard sequence, the original Kara android from the tech demo that inspired Detroit: Become Human can be found among the wreckage in an extremely dilapidated state. She sings the same song that she can be heard singing in the tech demo.
Once you've finished the game and return to the main menu, Spoiler: when Chloe, the android who serves as a guide, asks you if she could be set free, it was originally intended that she'd permanently disappear if the player lets her go. However due to player requests, in an update it was made that if the player had let her go, they could later be asked if they wanted another Chloe android to take her place.
Very early on in the game, if the player makes certain unorthodox decisions in the Kara storylineSpoiler: it is possible to have both Kara and Alice die extremely early. If the player goes to the Main Menu right after doing so, Chloe will slightly break the fourth wall and scold the player for "letting them die". She will then tell the player that the "lives of these androids are in your hands".