For Seraphina, Roxy, and Aurora's Scenes, you have to do this before Night 9
Lexy's Scene: You get her Scene on Night 6 by choosing the "Have Some Fun with Lexy" option.
Seraphina's Scene: You get her Scene by learning about her past on her Thumbdrive which need 2 passwords. The 1st password is CobaltBahamut, You discover this password when choosing to talk to Seraphina on Night 4. The 2nd Password is TomNovember, You discover this password when choosing to tell Seraphina about Lexy on Night 7. After finishing learning her past on her thumbdrive you get her Scene on Night 9. (If you already know both passwords, you do not need to talk to Seraphina on Night 4, but still tell her about Lexy on Night 7.)
Roxy's Scene: To get this you need to only talk to Roxy's AI 1 time, and after that talk to Roxy and choose the "Tell Roxy about her AI" option and then choose the "Shut It Down Immediately" option. After that wait until after Night 6 to get help from Lexy to shut down Roxy's AI (because if you choose to shut down the AI by yourself its Game Over). So after Night 6 choose to talk Roxy's AI to shut her down. And then you get Roxy Scene on Night 9.
Aurora's Scene: To get this, you need to talk to Aurora's AI 2 times, on the second interaction of her AI choose the "Offer to Create a Bridge" option. And then, talk to Aurora 2 times, on her second interaction choose the "Reveal Aurora's Past" option. After that talk to Aurora's AI 2 times after Night 6, on the second interaction choose the "Run the Gestalt Program" and after that is when you get Aurora's Scene.