Не понятно почему корректно использовать такие структуры.Все предложения взяты из книжки

Не понятно почему корректно использовать такие структуры.

Все предложения взяты из книжки "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, Im sorry, because Father had had to come to the police station, which was a bad thing.
2)Тут вроде бы использован past perfect, но затем ещё раз почему-то опять 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 couldnt take orders. "
3)для чего тут had, о чём он нам разговаривает ?