Factual error: After the intruders flood the panic room with propane, Jody Foster's character gets a lighter and ignites the propane causing it to burn along the ceiling. This would be impossible as propane is heavier than air and would sink to the floor rather than rise up to the ceiling. Lighting a flame in that room should have caused anyone in the room and on the floor to be engulfed in flames almost instantly.

Revealing: Near the end of the movie Dwight Yoakam is holding Jodi Foster's daughter captive as he tries to exit the house. Jodi Foster sneaks up behind him with a sledgehammer and swings it at his head. He turns to face her and the metal end of the hammer catches him firmly in his temple, knocking him down a flight of stairs. A few minutes later he comes up the stairs and tackles Jodi Foster to the ground seemingly unhurt by the impact of the sledgehammer.

Continuity: During the first meal in the new house, the level of Coke in the daughter's glass keeps changing as the camera cuts between her and her mother. The Coke can revolves as well. Sometimes the Coke-logo is visible, at other times the list of ingredients is facing the audience.

Audio problem: When Jodie Foster first hears a ring at the front door, Steven says, "The police." and Jodie says, "You called the police?" He responds with, "Of course I did. You scared the s*** out of me." When he says, "You scared the s*** out of me.", his mouth movement does not match what we hear.

Factual error: The mother tells the daughter to keep warm and drink water. In fact that would lower the blood sugar faster. This method is used for high blood sugar to lower it back to normal.

Continuity: When Meg and Sarah are inspecting the house in the beginning of the film, Sarah's bag has pawprints on it in the first shot. In the second shot the pawprints change to faces.

Continuity: The girl is inside the room with Forrest Whitaker and the other guy, about the time Whitaker picks up the red thing with the needle, watch the loose hair on the right side of her head, close to her ear: It keeps moving up, down, sometimes is wetter, sometimes dryer. And the girl barely moves.

Plot hole: Jodie Foster's call to 911 would force the police to investigate even after she hung up when being placed on hold. This is standard operating procedure for all police departments.

Continuity: When Junior is shot in the head, the original bullet wound is almost exactly between the eyes, but when you see him lying on the floor, the bullet wound is over his right eye