The trigger words, translated/subtitled from Russian into English, were:
- Longing
- Rusted
- Seventeen
- Dawn
- Stove
- Nine
- Kind-hearted
- Homecoming
- One
- Freight car
No exact explanation has been given what the words actually reference, but hypnosis typically involves words and phrases in sequences that are unlikely to be randomly said in order.
You would think that "homecoming" is an out-of-universe nod to the upcoming Spider-Man: Homecoming, but the screenwriters dismiss that that connection being made as "fairly accidentally".
Additionally, Bucky fell from a freight car when he was lost and presumed dead. Finally, Bucky was born in 1917 (one, nine, seventeen)
