Anyone notice a problem with this photo?

[KeithB]

In "Surely You're Joking, Mr Feynman" he describes the algorithms he used to take care of this sort of thing when they were using ladies with calculators to perform calculations at Los Alamos. Rather than stopping the calculation and starting over, they would introduce a colored card with the required correction, these cards would have priority and would soon catch up to the erroneous result and the calculation would then proceed.