Continuity mistake: When Frank pursues the killer at the lake house, through the snow-clad forest, his breath doesn't show. But he comes from a warm house directly out into a freezing night air.
Continuity mistake: In the scene where she takes him into the boutique, she goes into a dressing room with a curtain across the opening. The shot pans from looking over the curtain, where it has 5 ruffles, to Kevin Costner and then back over the curtain which now only has 3 ruffles even though she hasn't come out. (00:27:45)
Answer: The fact that Frank hires an older gray haired bodyguard for Rachel after he quit tells me that he didn't want her getting involved with another man, because his intention was that he would be involved with her.