Continuity mistake: When Sam hands the bureaucrat the letter from Jon Snow, in the shots facing the bureaucrat, the wax seal is on the left side of the envelope (when seen from Sam's perspective). In the shots facing Sam, the seal is on the right side of the envelope.
Game of Thrones (2011)
1 mistake in The Winds of Winter - chronological order
Starring: Lena Headey, Peter Dinklage, Emilia Clarke, Maisie Williams, Michelle Fairley
Tyrion Lannister: The Eyrie. They say it's impregnable.
Bronn: Give me 10 good men and some climbing spikes... I'll impregnate the bitch.
Trivia: Cersei remarks to Tyrion that she had heard his nose was cut off during the Battle of Blackwater Bay. This is a reference to the books, in which part of Tyrion's nose was indeed cut off.
Question: Is there any place in the books, movies, or directly from George R.R. Martin to say why the Game of Thrones world has such unpredictable seasons? Magical, Scientific, Alchemical (ie in-between).
Chosen answer: Well Magic does come to mind. The White Walkers bring with them the winter. Because of this, the seasons are very unpredictable. "Winter Is Coming" refers to this.
lionhead