Doctor Who: 10 Things That Make NO Sense In The Modern Series
6. The Image Of An Angel Becomes An Angel... Sometimes
When the Weeping Angels returned in Series 5, Steven Moffat introduced several new elements to their lore, such as their ability to snap people's necks, their ability to steal the voices of their victims, and their ability to laugh.
Another rule that was also established is "that which holds the image of an Angel becomes itself an Angel", which basically means that any pictures or videos of Weeping Angels will eventually turn into real Weeping Angels.
It's an interesting idea that is put to good use in a creepy sequence where Amy is cornered by a recording of an Angel, but unfortunately, this rule does create a big issue when you look back at the first appearance of the Angels in Series 3's Blink.
In the final scene of this story, protagonists Sally and Larry are shown holding a folder that contains everything they know about the Angels - including several photographs.
So... why don't these photographs turn into real Angels?
In The Time Of Angels, it's mentioned that the Angels in Blink weren't at full strength, but still, we never get a solid explanation as to why these photographs don't adhere to the rule that Series 5 established. Of course, Moffat hadn't thought up this rule when he wrote Blink, but it's an irksome inconsistency regardless.