Go to the scene where Meryl Streep and Robert Redford are at the New Year's Eve dance. I think it's after they've danced. The movie switches back and forth between them as the talk. Redford's hair is all nice and fluffy, then next time the camera goes to him it's slicked back, then fluffy again. This isn't a case of his hair just getting smoothed back by hand, it styled completely different.