when the family is getting in the cars to go to the wedding, the ladies get in the car and so do the grandmothers. But, when they pull out of the driveway, you can see the short grandmother crouching by the car, and in the next scene she is in the car again.
Good catch! I went back and noticed that after I saw this slipup. I'm sure it was not meant to be seen, but you can tell the actress who plays the grandmother meant to hide behind the car. If she was picking something up, she would not have stayed down as she saw the car pull away. Then again, if she did go to pick up something and saw the car driving away, she might have tried to not mess up the scene by staying down.