While at the Indian village before the ritual the elder Indian put black ash under Emily's eyes the next scene it isn't there and the next scene it is back again.
Emily's face paint changes from some, to none, to more, to less several times in the ceremony.
Emily states in her support group that she is abducted every 7 years on her birthday. When Emily first suggests to Chris that he see the evidence of her abductions for himself, she says that she is approaching her 20th birthday. But earlier she says that she was abducted on her 7th and on her 14th birthdays. So her next abduction should be on her 21st birthday.