Generally, this awareness is brief; it's used for a joke or two and then never mentioned again.
Used this way, it's Lampshade Hanging as applied to Paratext. Compare with other metafictional devices, particularly Painting the Medium, which uses Paratext and artifacts to tell the story, and Reading Ahead in the Script which is exactly what it sounds like.
Left the Background Music On is a specific inversion.
Fourth-Wall Observer is what happens when a particular character has this on full-time and the rest do not.
Cut to film: they appear, hesitate, and go back inside.
Cut to film: of them appearing at the door hesitating and then closing door.
Cut to studio: with increasing panic they run to the second door.
'Well normally, yes' Sonic agreed, 'but at the moment we're characters in a book.
See also Genre Savvy (which doesn't involve the Fourth Wall) and No Fourth Wall.See also End of Series Awareness and Screen Tap; specific subtropes. ' asked Tails, who had joined them by the ailing rabbit.Audiences are good at figuring out which elements of a work are on which side of the Fourth Wall.No explanation is necessary for why our hero can hear a ringing telephone but not the movie's soundtrack, or why the space ship is menaced by the Negative Space Wedgie, but not by the opening credits drifting by outside the ship: it's something we accept as part of our Willing Suspension of Disbelief.
It's also a wonderful thing to play with, and that is what Medium Awareness does; the characters acknowledge and interact with elements and conventions of the medium that shouldn't technically "exist" in-universe.
Suddenly the characters can hear the ominous background music or the disembodied narration, they can read the subtitles at the bottom of your screen, and they can tell when it's almost time for a commercial break.