Continuity mistake: Travis rearranged a photo on the desk, setting it partially in front of the box and the two pictures were a few inches apart. The next wide view showed the corner of the picture almost aligned with the box or slightly behind it and the two pictures were now almost touching. The angles and locations of the photos changed more than once. (00:09:40 - 00:10:03)
Revealing mistake: The appearance of the buildings/scenery opposite of FBI Director Gabriel Robinson's office vary, indicating the occasional use of a "green screen." The angles are inconsistent (wider or in the opposite direction) and sometimes grass and/or trees can be seen where the avenue between the buildings should be visible. (00:10:05 - 00:10:38)
Revealing mistake: When Travis was talking to his daughter Amanda at his granddaughter's birthday party, the background scenery was inconsistent (indicating use of a green screen). Some objects (e.g, brown hanging lampshade? And balloons) should have been visible when they were not and/or were in different locations. Balloons that were to the left of the screen near Amanda "disappeared" in wide front shots. (00:13:05)
Revealing mistake: When Travis arose from the couch, "Little Man" - sleeping right next to him - did not move at all or even open his eyes, which would be extremely unlikely for a "real" dog; the dog, though appearing to be "breathing", was fake. (01:17:30)
Character mistake: After Travis confronted FBI Director Gabriel Robinson (killings and telling him to go public about Operation Unity), Gabriel said, "I am the director of the most powerful organization in the world." There may be interpretational issues regarding the meaning of "power" and what constitutes an organization (versus corporation, law enforcement agency, company, etc.), but the FBI is NOT the most powerful organization in the WORLD (the U.N. is?) and probably not even within the U.S. (01:31:50)
