When Danny visits the prison, he says that he has come to see inmate 43990, and the guard confirms that it is Danny's brother. However, when Danny's brother meets him, the prisoner number on his jumpsuit is 35319911.
Sean tells the FBI he was watching TV when his mother Martha was accidentally injured putting her hand through a glass kitchen cabinet door. Sean was clearly playing video games.
After Martha attacks the drug dealer, she has a large amount of blood on her. When her husband appears a few seconds later, she now has no blood on her. He makes a comment about cleaning her up, but there was nothing to clean.