There is a grammar error near the end of the show when the smart phone close-up of the "ANONYMOUS Email" page is shown. For about 2 seconds we see this page with some bullet points. One of the bullet points says: Find out if your friend is are real friend.
John tells Fusco that he's going to send him a photo of Caroline Turing. When he takes a photo she's sitting down, reclining but the photo Fusco receives shows her standing up.