When Mason Jr. and his stepbrother are playing Halo 2, although the scene is shot as a single uninterrupted game, the map changes every time the TV screen is shown.
When Mom introduces her son to her future husband after his lecture, the clock on the wall jumps between 8 o'clock and 2 o'clock in different scenes.
In one of the first scenes of the movie when the Mom is driving Mason and Samantha in her car, they drive by a street with an old car and a boat in the driveway. A few seconds later, they drive by the same street with the same car and boat.
When the saw blade is thrown into the piece of wood the second time, in later shots it is in a different place on the wood and deeper into it as well.
While Mason is driving to his high school graduation party the clock jumps backwards and forwards to times between 7:28 and 7:30.
When mom is lecturing in the college class, the name on the ink board says "John Bowlby 1909-1990". John Bowlby was born in 1907.
While playing Halo 2, the audio indicates one of them is dead and respawning but the video shows both players running around like normal.
When Bill Wellbrook sends the boys to cash a check at the liquor store, the drivers license does not have his name. It's blurred, but very likely looks like the name of the actor, Marco Perella, on it instead.
In an early scene in the movie, Mason goes to a man's house and asks if he could put an Obama campaign sign on his lawn. The man angrily refuses and tells Mason to leave. As Mason is leaving, the man shouts to him "You're on my property. I could shoot you!" in reference to The "Stand Your Ground" Law in the state of Texas. However the man is incorrect. Since Mason poses no threat to the man and left when the man told him to, the man has no right to shoot Mason and would be prosecuted for murder if he did. The "Stand Your Ground" law in Texas clearly states that a resident/tenant cannot use deadly force on a person because the person is simply trespassing. A clear and present threat must be posed to the resident/tenant for deadly force to be permitted.
The scene at the Houston Astros game where Roger Clemens is pitching was taken from August 30, 2006, when the Astros defeated the Milwaukee Brewers 1-0. Dad later tells his friend that "Lane won it with a 3-run homer," which did not happen. In fact, the only 3-run home run Jason Lane ever hit against Milwaukee was in the bottom of the 7th inning on April 17, 2006. The actual footage of Lane circling the bases was from the Astros' 5-2 loss to Milwaukee on August 18, 2005 - a year before the Clemens footage. All of these dates were determined from cross-referencing the out-of-town scoreboard in the background.
When Mason is calling his dad using the iPhone, the image of him in the corner of the phone screen is not the same as how he looks while having the call. Notice his hair is very different.
When driving down the freeway in the new van, on the way to celebrate the Mason's birthday with guns in the country, the van shifter is in park. Most notable in the shots from the front of the van as the dash mounted shifter is all the way up.
When married to the professor, the span between marriage and separation is approximately 3 years (20 questions game 2004- date written on check to liquor store 2007) The house looks the same but the front door is different. When they come home from the honeymoon the door is a light oak. In the scene where Mason has to go to school with the new haircut it's a dark oak and the glass design in the door is an obvious Texas star. Pictures to the right are the same with both doors except in the last scene when she leaves Bill. The picture on the right side of the door is different.
When the two kids get picked up by their dad they argue over who gets to sit in the front seat. Mason decides that Mason Jr can on the way there and Sam on the way back. When they get to the car both kids get in the backseat of their own volition.
A camera crew is reflected in the car glass, when Mason and his family leave in the new van.
(around 1 hr. and 12 min.) When the Ford Explorer arrives at middle school and Mason gets out, the camera crew is reflected on the door as it swings open.
(around 11 min.) When Olivia and the kids arrive at their new apartment, the cameraman is partially reflected on the car's back windows.
Camera shadows sporadically appear in some points of the movie.
(around 45 min.) The cameraman is vaguely reflected on Mason Evans Sr.'s car door.
When Olivia is looking at her bills at the kitchen table of her San Marcos home and talking about downsizing, she is holding a City of Austin utility bill.
When the family moves to San Marcos, Mason is forced to change schools. The first time his middle school is shown on screen, one can see the name "Bedichek Middle School" on the side of the building. Bedichek Middle School is located not in San Marcos but in Austin.
When the family is moving to Houston, we can see a bumper sticker on Olivia's car that reads, "Atherton Elementary Honor Student On Board." Atherton Elementary is located in Houston.
When the professor quotes from the Rolling Stones song "Bitch" he says, "when they call your name, I salivate like a Pavlov dog" The actual lyric is "When you call my name, I salivate like a Pavlov dog."