Before this episode, Cutler's first name was Brian as revealed by news reporters and Mayor Delgado in Season One episodes. Here, his name suddenly becomes Leo.
Jessica says that Witness Protection is run by the FBI. It is actually run by the Marshals' Service.
Language mistakes. When Derek Markham is being shown photos of his family, the supposedly convincing Russian writing on the back of the photos is botched: Photo No.1 (left): the text is meant to say "Kill her", but 'her' is pronounced "ee", not "ie" (transliteration) in Russian. Photo No.2 (right) translates as: 'Find them, they are being killed' , whereas the obvious one should be 'find them and kill them''.