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River carries a sonic trowel. While this reflects her profession as an archaeologist, it is also something of a family tradition: her grandfather, Brian Williams (the father of companion Rory Williams), always carried a trowel.
Steven Moffat intended for a while to have this be his last episode before passing the show to a new runner, hence his using it to finally tie off his very first original plot thread. Then he decided at the last minute to stay a while longer.
This is the first episode where both the Doctor and his companion are played by people over the age of 50.
Among the items River Song removes from her bag to make room for the head is a red fez.
The Doctor says that River was once married to Stephen Fry. Fry has a long history with the show, going back to before its revival. He provided the voice of a character in the animated mini-series Doctor Who: Death Comes to Time (2001) and once wrote an episode during the Russell T. Davies era but it required rewrites to make the budget more manageable and he couldn't do them in time (the slot was taken by Doctor Who: Fear Her (2006), which, at the time of this episode's broadcast, was the joint lowest-rated episode of the new series).
"River Song: When you love the Doctor, it's like loving the stars themselves. You don't expect a sunset to admire you back. And if I happen to find myself in danger, let me tell you, the Doctor is not stupid enough, or sentimental enough, and he is certainly not in love enough to find himself standing in it with me! [River glances back at the Doctor, who offers a small smile... and then falls into a stunned silence as she finally realizes who he truly is] The Doctor: [whispers] Hello, sweetie."
"[last lines] The Doctor: They've been there for millions of years, through storms and floods and wars and... time. Nobody really understands where the music comes from. It's probably something to do with the precise positions, the distance between both towers. Even the locals aren't sure. All anyone will ever tell you is that when wind stands fair and the night is perfect, when you least expect it, but always... when you need it the most... there is a song. River Song: So... assuming tonight is all we have left... The Doctor: I didn't say that. River Song: How long... is a night on Darillium? The Doctor: Twenty-four years. [River gasps in shock and relief] River Song: [tearfully] I hate you. The Doctor: No, you don't."
