Photographs of each of the real-life historical figure featured alongside whom playing each of them in the opening credits: Tan Kah Kee (played by Chen Shucheng), Lim Bo Seng (played by Rayson Tan), Elizabeth Choy (played by Xiang Yun), Sybil Kathigasu (played by Jacintha Abisheganaden).
What were in black and white are the actual war footage, including towards the end of the opening credit of an actual newspaper report.