Julia (Jennifer Garner) *does* get on the plane to San Francisco but when she goes to the hospital to ask about Dr. Copeland, the nurse answering the phone says "LA Hospital".
When Eddison leaves the house and takes off on his bike, we view the street and the activity on that street. When Grace immediately backs out of the driveway to follow him, it is a different street.
In the scene that begins with Kara Monahan lying on the floor crying, there were M&Ms spilled on her laptop in one shot, but on the next shot they were no longer there.
When Alphonso's pink delivery van hits the black SUV, the SUV's rear-view mirror disappears half-way through the scene.
When Edison and Rani are warming up for soccer practice, Edison throws the ball up and headers it twice in succession without being thrown the ball by Rani.
The Hollywood Forever Cemetery only shows movies during the summer, not in February.
Julia never left to go to San Francisco. This can be heard when she calls Kara on the phone and says that she is still in LA.
At the beginning of the movie when Kelvin is talking to Susan during the morning news broadcast, a map with the day's forecast shows a high of 90 in Sacramento, highly unlikely for February 14 in the middle of winter.
When Julia visits the hospital to find out if Dr. Harrison is married or not, the opening shot of the building shows somebody using a leaf blower to tidy leaves, even though the film is set in the middle of February.
Around 00:24:40, when camera shows the car's back, we see that it's on a trailer cause others cars are too low (confirmed on blooper's scenes during credits).
At the flower market, when Reed meets Kelvin and at the agents office when Paula initially speaks to Liz, the characters speak, and we distinctly see their mouths move, but it is very clear that they are not saying the words that we hear.
(around 47 min.) Reflected on the SUV.
At the beginning of the movie, Reed puts the ring on the middle finger of Morley's right hand. He should have put it on the ring finger of her left hand.