Kate says "Five rounds rapid" which her father, The Brigadier, said in this episode.
At the start of the episode The Doctor uses a Union Jack parachute to escape from the exploding plane and Roger Moore used a similar parachute to escape from Soviet agents.
In Clara's dream world, ordinary household items are shown stripped of their trade dress, which is replaced with a utilitarian description of the contents. Sunglasses also play a role in both stories.
The third Osgood wears the duffel coat and scarf The Doctor wore in this episode.
The Doctor discusses the difficulty of making the decision he made during the Time War and the Osgood Boxes are designed to resemble The Moment.