Usually at the end of an episode, the King Pig is brutally beaten and looks at the birds and the player and oinks while blinking with its left eye. However, at the end of Danger Above, the King Pig does it with his right eye, due to the fact that the birds have hung him upside-down, although technically it's his left eye that blinks, it's really his right eye.
As of the 3.0.0 update, the forest background has a slight difference to the old one, including how the trees are formed.
This is the only chapter that has the pigs shown above, rather than the right during the opening cut-scenes.
This is the only chapter in which the Yellow Bird has a "!?" symbol on its head, rather than a "#" symbol when he looks at the pigs above in the cut-scenes.
This is also one of the two chapters featuring the balloons. The other is The Big Setup.
Danger Above is also the first episode where the Boomerang Bird could be found captive and unplayable in one of the levels, with the second being the Big Setup.
This is the first episode to have 15 levels on each theme.
Since the 3.3.0 update, a sprite for a Danger Above 2 can be found in the Angry Birds PC files. This might or might not be confirmed. Danger Above II appears in Angry Birds Free for iOS, but it is unknown whether it will come to PC or not.