Mark steals one cigarette from his mothers purse. Minutes later, when Mark and his younger brother go to the woods to smoke the cigarette, he lights a second cigarette for his brother while Mark is smoking one for himself.
When Romey re-inserts the hose and handkerchief into the tailpipe (after Mark removed it) his fingers and hand touches the tailpipe a number of times. This is impossible without burning the fingers. Also, the handkerchief after coming out of the tailpipe is as clean as when it went in.
As Mark crawls up to Romey's car from the right hand side, Romy sees him out of the right wing mirror viewed from inside the car from 06:38 to 06:40 on the DVD. In the mirror, Mark is crawling straight toward the mirror, while in previous and subsequent shots he is crawling to the back of the car from the side.
Police investigating shooting at Romy's house would have surely found the body in the boathouse.
Reggie's hand at the end of the movie. When she is hugging Mark sometimes her right hand is on his head, sometimes her left. Sometimes one hand is on his shoulder and in close-up it's on his head.
When Mark is quizzing Reggie about Led Zeppelin, Reggie says that their first three albums were titled "One, Two, and Three". Her explanation of the title of their fourth album was correct, but their first album was simply self-titled as "Led Zeppelin". It is referred to as "Led Zeppelin One" or "Zeppelin One" by their fans because of the numbered albums that followed its release.
Both doors to the boathouse are locked from the inside. One with a chain, the other with a padlock.
When the lawyer shoots through the side window of the car (at the beginning of the movie), the entire tempered glass window would normally shatter into small glass bits instead of well defined bullet holes.
Some have suggested that Mark could not be charged with obstruction of justice simply for lying or refusing to cooperate with the FBI, because of the 5th Amendment. This is not true. Lying to the FBI/prosecutor/police officer can result in a charge of obstruction. Refusing to answer questions will quickly result in a formal subpoena; if one then continues to refuse to testify, he could be charged with contempt. The right not to speak to police or prosecutors (the 5th Amendment) only consists of the right not to incriminate oneself of a crime. However, at the court hearing, Reggie tries to argue around this limitation by pointing out that the prosecutors vaguely implied that Mark could've been involved in killing the lawyer. But the judge doesn't buy it (and the prosecutors could easily get around the problem by giving Mark a guarantee of immunity). If he refused to testify, Mark could be charged with contempt of court. If he lied, he could be charged with obstruction of justice, lying to a federal agent, and/or perjury.
When the little brother Ricky is in a coma or is suffering from PTSD he is completely comatose and would not speak or move, so he should have had a feeding tube either in his mouth or in his nose, which he did not have. Ricky would have also had a nasal cannula for oxygen, as all coma patients do. He is not in a coma because his eyes are open.
When Mark asks Reggie why her kids don't want to see her, she states that it's because after her divorce she drank a lot. However, she goes on to tell her story about what happened and that the court declared her unfit, and that it wasn't until after her kids were already taken away from her that she started drinking. How could her kids be around her when she was drinking, if they had already been taken away? However, there may have been other reasons besides drinking (such as mental problems) that she may have been deemed unfit.
At 1:03:05, a woman is seated in the restaurant, in the right of the shot. She turns her head and looks directly into the camera for a split second.
At 1:32 when Mark opens the passenger side front door, the interior light doesn't go on.
Romey pointed the revolver at Mark. Seen from Mark's viewpoint there were no bullets in the revolver. Romey fired three shots.
After the shootout at the boathouse near the end, when the bad guys jump into their boat to escape, a diver is visible out in the lake beyond their boat for a second.
Reggie is driving the wrong way across the Mississippi River Bridge to reach New Orleans from Memphis.
When the private jet is on the ground in Memphis leaving for New Orleans, the Lakefront Airport Terminal is seen in the back round. Lakefront Airport is located in New Orleans. The terminal and old control tower is shown again after the plane lands and departs for Phoenix.
Nothing that Mark learned from Romey about the murder can ever be used in court. The statements Romey made were protected by attorney-client privilege and only his client (the murderer) could grant him permission to tell anyone else. In addition, the FBI and prosecutor would know this, and would not want Mark to tell them, because of the "fruit of the poisonous tree" doctrine.
Reggie Love tells Mark Sway, "dead men don't sweat". But Romey would have had residual sweat left over after he died so he still would have been "sweaty".
When Gill Beale hands the injured guy at the hospital one of his hand bills, it has no address or phone number on it. Lawyers always make their phone number the largest thing on their ad. The injured guy would have no way to contact Gill Beale making the hand bill useless.
In response to unethical/illegal questioning of her client, Reggie threatens to make the evidence of it public. Roy replies, "That's blackmail", but it is not.
When Mark uses the Detective Nassar's credit card to order $200 worth of pizza, the woman from the pizza place never asks him for the card's expiration date.
When Reggie Love and Mark Sway are talking about going to New Orleans, Reggie says that she has to find a map to get to New Orleans. Anyone from Memphis should know that New Orleans is about 400 miles south of Memphis on I-55, thus having no use for a map, unless she wanted a map of New Orleans.