In the last shot, you can clearly see a Masonic symbol on the sign as it lies in the fire.
When Jamie goes into the burning print shop to save young Ian, he jumps over a railing to the floor below. The long dark wrap on his upper body swirls around him as he lands in a super hero stance with his hand on the floor. This a nod to Sam Heughan who starred as Batman for two years in the touring stage show 'Batman Live.'
The Chinese character Willoughby is unfamiliar with the medical procedure of trepanation. This procedure had been used in China since the iron age.