In the opening, Lucifer tells Rory the view is one only angels and "very persistent pigeons" ever get to see. As if to accentuate his words, the body of a pigeon who didn't quite make it lies unremarked behind them.
Maze calls Adam "you first pancake of a human". For you non-cookers, the griddle temperature is very important in making pancakes and often starts out too hot. As a result, the first pancake burns. Many cooks just automatically toss out the first, and presumably defective, pancake.
The title is said by Lucifer.