Continuity mistake: There is a long scene wherein Meryl Streep is sitting in a bay window going on about something. When we first see her, her eyes are brown. Moments later, they are blue. At the end of the scene they are brown again.
Continuity mistake: Meryl Streep as Sophie emotionally describes the loss of her children and rubs her eye, smudging her eyeliner which makes a small black line out to the side of her face. In the next shot, the smudge has disappeared.
Continuity mistake: When they are having the outdoor picnic celebration, Nathan gives Sophie a dress and a shoebox containing a pair of new shoes. When Sophie puts the shoes on it is obvious that the undersoles are stained and worn.