I can't believe this! I just measured my rodinal in the same beaker that I measured my photo flo in! ... So is my whole roll kaput? Is it going to be dead in the developer?
Many years ago, there were those who recommended adding a small amount of photoflo to film developer. The logic was that photoflo relaxes the surface tension of water, and therefore adding it to developer will help minimize the risk of "air bells", bubbles of air that get trapped on the surface of the film and cause uneven development.
More recently, people have come to understand that proper agitation, perhaps combined with a presoak, will do an adequate job of preventing air bells, so you don't hear about adding photoflo to developer any more.
So I would not be excessively concerned. But I would also make a point of not contaminating developer again - contaminating developer is a sign of poor discipline, and the next time that lack of discipline could have more serious consequences.