Continuity mistake: When Gracie and Clonsky are at the bank, there is a tray attached to the handle of the carriage (with a sippy cup). After Gracie tells the "housewife" there's an agent in the carriage, in the shot facing Gracie as she tips the carriage, the tray comes loose. However, in the next shot the tray is still attached.
Revealing mistake: While Gracie chases "Fake Dolly," as Dolly runs past the Asian couple her supposed spike heeled shoes have a filled in flat base between the fake spike heel and sole, obviously making it easier to run. When Gracie pins her to the ground, Dolly wears real spike heeled shoes.
Audio problem: More than once Gracie or a member of her entourage is seen watching the distant pirate ship battle from the hotel window. The cannons fire and the blast is heard immediately. In fact, at that range (several thousand feet) there would be a discernable interval between the muzzle flash and the arrival of the weapon report.
Visible crew/equipment: When Gracie spots "Fake Dolly," Dolly runs and Gracie begins her pursuit. Then just as Gracie trips on the luggage cart, her pretty orange blouse flies up at the back and Sandra Bullock's mic transmitter is visible at the back of her pants. (Note that a bit earlier, after Sam elbows Gracie in the ladies room, it isn't there as Gracie stands up.)
Continuity mistake: At the bank, when Gracie pushes the carriage into the "housewife," she leaps on the woman, the gun goes off and the carriage falls. After it cuts to Clonsky being hit by the bullet, when Gracie and the woman hit the ground the carriage is standing upright. Yet a few shots later, as they grapple for the gun, the carriage is overturned on the floor.
Deliberate mistake: When Foreman is taking Gracie, and Sam to the hotel, you can look behind Foreman at the background you can see the newer Las Vegas Strip. At first, you can see them going toward the bridge that connects the MGM Grand to New York, New York. In the next shot, you see a completely different part of the strip that is nowhere near New York, New York. Then when Sam says "Where's the best place for me to throw up?" if you look behind Foreman, you can see the Brooklyn Bridge, which means that they are now going the other way.
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.
Add timeTimmy O'Toole