Continuity mistake: When Dexter confronts Mrs. Fitzwaring, she points a gun at him. That gun is a Beretta Model 70. However, later on in the confrontation, the gun she is pointing at him is now a Heckler and Koch P7M13.
Factual error: Radium Chloride (stated by the doctor to be the ingested poison) does have a slightly luminous glow to it, but absolutely doesn't have the intense shining bright green luminous glow that is shown at the end of the film in Professor Cornell's mug.
