Continuity mistake: When Ellen DeGeneres is looking through the family photo album, she partially lifts the page to turn it, showing that the following page is blank. The next shot from a different angle, she turns the page to see more pictures. The same thing happens again right before she finishes looking through the album.
Revealing mistake: When Martha is in her office and the phone rings, when the camera shows the phone, no line is lighting up, yet when she picks up the phone everything is normal and the phone conversation starts. Having owned one of these phones, first of all since they are multi-line phones when a light is flashing green that means an incoming call and a solid red means a line is being used but none of this stuff shows up in the scene. Second of all, the secretary earlier on in the movie says she has a call on line two, therefore proving she has more than one line on the phone.