Mangold would later reveal that Jackman was very involved in developing the story, saying, "Hugh and I have been friends for almost twenty years now, and he was there every step of the way.
Mangold kemudian mengungkapkan bahwa Jackman sangat terlibat dalam pengembangan ceritanya, dengan mengatakan, "Hugh dan saya telah berteman selama hampir dua puluh tahun sekarang, dan dia ada di sana setiap langkahnya.