For a tangential remark, this isn't very accurate:

• And John Galt gave his three-hour-long, 60-page speech over a radio network he had illegally pirated. None of the government mooks thought of breaking down the door and arresting him for that whole time.

Removed:

• Quentin Tarantino has turned this trope into a fine art, with characters often serving as platforms for his own views on various films or aspects of pop culture, usually finding a way to relate it to the themes of the film.
  • Kill Bill Volume 2 has Bill momentarily possessed by Tarantino so he can talk about secret identities of superheroes, implying that the Bride cannot escape who she is.
  • In Death Proof, various characters speak highly of old-fashioned car movies like Vanishing Point, of which the film is an homage.
  • Sukiyaki Western Django skips the possession part and instead features a long cameo of Tarantino talking about anime.
  • Inglourious Basterds has Bridget von Hammersmark explaining that a character has nothing to do with the creator's origin. A character is its own person despite being of different origin than the creator. All while she is speaking German.

I'm not sure these are severe enough to qualify for the trope. There's a case of Writer On Board and Author Appeal, but the narrative doesn't stop dead for Tarantino to deliver a monologue. It usually relates to the plot or themes, or is part of the overall style.