Roots: Steven Moffat previously used the name Sally Sparrow and the idea of the Doctor leaving a message behind wallpaper in the 2006 Doctor Who Annual story 'What I Did on My Christmas Holidays' By Sally Sparrow. There is a reference to Scooby Doo.
Goofs: Hull does not have the kind of rolling hills seen in the Hull scenes.
The TARDIS is a living being, and its scanners detect the immediate area, so why don't the Angels permanently freeze once they're in the car park, and – again – in the cellar.
How do the Angels take the TARDIS back without being seen?
The hospital ward has three empty beds, and the floor appears to be concrete floor and have a pool of water on it. I know the NHS operates on a tight budget, but that's taking it a bit too far.
The Doctor says that the Angels send people back in time, and eat the energy that would have been used by the person's life-in-their-original timeline. Surely the victims would just expend an equivalent amount of energy in the past timeline. Where does this extra energy come from? Add in the energy needed to transport them to the past in the first place, and the Angels are seriously breaking the law of conservation of energy.
How did the Doctor know how long to pause between sentences? Yes, he had Sally and Larry's dialogue written down, but he has no way of knowing how long to pause between sentences. Also, there are parts of the conversation which Larry isn't transcribing.
Why didn't Sally and Larry use the mirror next to the door to fend off the Angel by getting it to look at itself? [They were panicked and simply didn't think of it.]
In the final scene, there is a hairdresser's in the background with a six-digit phone number, but all London phone numbers are eight digits (including the leading 7 or 8). [Either Sally and Larry moved out of London when they started their business or the final number(s) weren't painted as well and wore off well before the others.]
Dialogue Disasters: The Doctor: "This is my timey-wimey detector."
Dialogue Triumphs: Kathy: "Okay, let's investigate! You and me, girl investigators. Love it. Hey! Sparrow and Nightingale. That so works."
Sally: "Bit ITV. "
Kathy: "What's good about sad?"
Sally: "It's happy for deep people."
Sally: "When you say you and the guys, you mean the internet, don't you?"
Larry: "How'd you know?"
Martha on the Doctor: "Trust me. Just nod when he stops for breath."
The Doctor: "People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint, it's more like a big ball of wibbly wobbly, timey-wimey stuff."
Memorable Moments: There are quite a few, but the ending where the camera shows a lot of statues, with the Doctor telling the audience "don't blink" must have been pure nightmare fuel for any children watching it.
Continuity: The Weeping Angels zap you into the past and consume the energy of all the days . They used to be called the lonely assassins. They're "as old as the universe, or very nearly". They are quantum-locked, which means that if they are seen by a living creature they freeze into rock/turn into stone. The four seen here could feast off the TARDIS if they got inside, but this would do enough damage to switch off the sun. They are capable of interfering with electric lighting.
Security protocol 712 of the TARDIS allows somebody to insert an authorised control disc (DVD) into the console – allowing the TARDIS to take a single trip. The TARDIS will then dematerialise, leaving its new occupant(s) behind.
Extras: This story has an episode of Doctor Who Confidential. The BBC website had an online commentary and a behind the scenes video podcast.
Location: Doctor's note in the wallpaper is dated 1963. The house is in the middle of London c.2007. Kathy ends up 5th December 1920 in a field outside Hull. 1969 before the moon landings.
Unrecorded Adventures: The TARDIS arrived at Wester Drumlins House, London, 1969. The Doctor and Martha were both touched by a Weeping Angel and ended up in 1969. We see the Doctor and Martha in the middle of another adventure.
Martha says that she and the Doctor have been to the moon landing four times.
The Bottom Line: 'Blink and you're dead. Don't turn your back. Don't look away. And don't blink.' This is truly brilliant. The concept is intriguing, the script sparkles, the acting is fantastic, the angels are brilliant, fully justifying their numerous return appearances. Carey Mulligan successfully plays Sally Sparrow as the lead role, and the montage at the end truly cements the Angels as one of the series' most memorable – and scary – villains.