Levi Miller and Jason Isaacs previously starred as the younger and older version of the same character in Red Dog True Blue,
Here they play father and son.
Australian swimming legend Ian Thorpe, as one of the Executive Directors, helped bring great authenticity to the competitive swimming parts of the movie as well as helping 17 year old Levi Miller train for the role of Benjamin Lane. Miller looked and acted exactly as you'd expect a champion boy swimmer of that age to be. Finally, Thorpe was able to help the director faithfully create the atmosphere of enormous pressure that has become a part of the Australian Olympic swimming success.
Jason Isaac and Levi Miller can both be associated with Peter Pan. Jason Isaac played Captain Hook in Peter Pan (2003) and Levi Miller played Peter in Pan (2015).