10 More Movie Reveals You Can Spot Early If You Really Look
2. Emily Has A Twin Sister - A Simple Favour
The Reveal
The corpse found drowned in a lake isn't Emily (Blake Lively) at all, but her twin sister Faith, who Emily murdered after she attempted to blackmail her.
How To Spot It Early
If you're a Blake Lively fan you've actually got a pretty good chance of figuring this out the moment Faith's body is pulled out of the lake.
In the close-up of her dead face, it's clear that "Emily's" facial mole has moved to the other cheek, seemingly confirming that she isn't the real Emily.
From there, the basic laws of deduction make it pretty easy to guess that Emily had a twin, rather than one of the two main cast members making a shockingly premature exit from the movie.