Continuity mistake: When Gracie is dressed as the old lady and is waiting in line at the airport, her false old lady breasts change place from shot to shot. Sometimes they are low and sagging, in other shots they are higher up. They also vary in how far apart they are spaced. This is BEFORE she moves them out of the way.
Continuity mistake: When Gracie askes Sam for coffee after the "SING" demonstration, she hands her a bill with her palm up. When they switch shots to see Saml, the top of her hand is up. They switch back, and her palm is up again.
Continuity mistake: When Gracie is on TV with Regis and Joy, they announce they have a surprise. Miss United States and Stan walk in and suddenly two more chairs appear next to Gracie which weren't there in the last shot.
Continuity mistake: When Gracie and Fuller are at the open mic, Gracie throws a lady's wig. In the next shot, the lady is putting on the wig again.