All images featured in the film were licenses under creative common licenses (followed by the following list of 14 celebrities, not including Rachel McAdams or George Clooney, and the source for each): Emilia Clarke, Emma Stone, Jennifer Garner, Jennifer Lawrence, Gal Gadot, Hillary Clinton, Rachel McAdams, Gwyneth Paltrow, Marion Cotillard, Bar Refaeli, Scarlett Johansson, Emma Watson, Mila Kunis, and Priyanka Chopra Jonas (as "Prianka Chopra").
Not in association with George Clooney or Rachel McAdams. The persons and events in this motion picture - even those based on real people - are entirely fictitious. Any similarities to actual celebrities is a result of your brain's misguided fusiform face area responsible for facial recognition.
During the credits, we see in parallel footage of the main actors before and after the visual effects, meaning before and after the faces of Rachel McAdams and George Clooney are over-imposed on them.