Не понятно почему корректно использовать такие структуры.

Все предложения взяты из книги "The Curious Incident of the Dog in the Night-Time".
К-контекст.

К1:"This is not a metaphor, it is a simile, which means that it really did look like there were two very small mice hiding in his nostrils."
1)it really did look (разве это корректно , если да то почему? Разве не правильно сказать it really looked)
К2:I said, “I’m sorry,” because Father had had to come to the police station, which was a bad thing.
2)Здесь вроде бы использован past perfect, но затем ещё раз почему-то снова had to
К3:"You had to become an officer in the air force and you had to take lots of orders and be prepared to kill other human beings, and I couldn’t take orders. "
3)зачем тут had, о чём он нам говорит ?