Fourth-Wall Observer is what happens when a particular character has this on full-time and the rest do not.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.
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.
Cut to studio: with increasing panic they run to the second door.
Cut to film: they appear, hesitate, and go back inside.
Cut to studio: they run to Sir William in the centre of the room..