Esther: I think people should always try to take the bad things that happen to them in their lives, and turn them into something good. Don't you?
When Kate, Max and Esther are in the grocery store, you can see 7Up packs on the bottom shelf. Then Kate's phone rings and when she answers it, you can see that on the shelf are 7up bottles instead of 7Up packs.
When Kate shouts "I'm not your f*****g mommy" to Esther, this is the same final dialogue of interaction between the antagonist and protagonist as in "The Ring 2".