Civil War visual effects supervisor Dan DeLeeuw recently discussed the inspiration for Tony’s particular look in this sequence during an interview – and it turns out that multiple mid-80s Downey roles played a part in its creation.
The effect was a stunning one then, but was taken to a new level in Civil War, since Tony’s scene was significantly longer and more graphically complex than that for Douglas.
This required RDJ to not only perform both Tonys’ lines but also try and match the stand-ins’ body movements.