When Grace talks to Babe in the kitchen, the handle of her coffee cup switches from her hand to the opposite side and back.
Babe states that her friend Tina Marie is attending the party via video chat all the way from "the McMurdo Station in Antarctica." The background clearly shows the South Pole Station (800 miles away) with the old dome visible, which was dismantled in the 2009-10 austral summer season. Also, the new station (the taller structure behind her head) doesn't yet have its dark grey cladding which dates this footage to be from about 2007 or earlier.