Kate is shown reading a book, 'Assassination Vacation', by Sarah Vowell. That author appears in a brief but credited role as a shopper. The actress playing Kate, Catherine Keener, is also a featured voice in the audio book of 'Assassination Vacation'.
Abby: And now we're two people walking around with shit in a bag. I mean... I mean, what if we didn't have dogs with us, and we were doing that? That would be disgusting. But, because we have dogs, it's normal.