Little Children (2006)

Continuity mistake: In the scene where May McGorvey is writing the letter to Ronnie in the hospital, the two "n's" are very close together, almost looking like the letter "m." This is shown again when Ronnie discovers it in her belongings when returning from the hospital. However, when he looks at the letter on the table after doing the dishes, it is two distinct "n's."

Brad Adamson: You have a nice place here.
Sarah Pierce: You think? Yeah, Richard does pretty well for himself.
Brad Adamson: Oh, yeah? What's he do?
Sarah Pierce: He lies.

Question: In the foursome dinner scene, Cathy checks under the table and sees something about Sarah's feet that heightens her suspicion about the affair. What does Cathy see? The camera seems to focus on Sarah's painted toenails, but I don't understand why that would arouse suspicion.