Hal Holbrook (Dr. Lewis Klatch) and June Squibb (Dr. Elsie Klatch) have also appeared together in Bones episode, The Final Chapter: The New Tricks in the Old Dogs.
In the Gallery, Bailey and Warren were talking about what they'd be like in 60 years and Bailey describes Warren as telling stories of "I sliced a woman open on a kitchen table in a rainstorm". That happened in Undo (Grey's Anatomy 13 - 1)
Till I Hear It From You is a song by the Gin Blossoms.