Questions on the Ending (SPOILER WARNING)
SPOILER WARNING!
Regarding the ending where Daniels is giving a lecture to FBI students:
1. He said she was known to have killed 8 people. Who were the 8? He didn't know about Bateman or Bateman's imposter because she only told Starkman who has been killed before he told anyone. I counted 7 with Gerty, her three competitors, Starkman, the Janitor and the night watchman. They wouldn't have known about the real Rachael. So who was the 8th one?
2. What happened to the real Elizabeth Macguire? Do we assume that Rachael later killed her and hid the body somewhere and took her place? Probably this was assumed off camera action.
3. Daniels saw Rachael's real parents but didn't know her name but why weren't the police notified to try to find the parents? For all Daniels' knew they were her parents.