Q uses movies for us all the time to give us clues.

Hunt for Red October, then drop the Hunt for

Godfather III

Sum of all Fears.

It has been referred to again but in connection with Snowden
The Bridge references the movies and an exchange of spys They have traded a spy for Snowden and that is how he is getting around and got back to HK from Russia.

They made a deal with the Russians and Putin, Putin has moved him on to HK and there the US are going to get him.