Continuity mistake: When William Petersen is talking to his kid in the supermarket, the cereal boxes behind him on the shelves change between two shots. The items behind Kevin also change during the scene. (01:09:05 - 01:10:20)
Continuity mistake: In the scene where Graham uses Freddy Lounds to plant a story about the Tooth Fairy in the Tattler, Lounds places a tape recorder on a desk. A few shots later, the recorder is back in Freddy's hand, and he places it on the desk again.
Factual error: Dr. Lecktor's cell has the hinges on the inside of the cell. They should be on the outside so Lecktor can't compromise them.
Continuity mistake: When Graham is reviewing the crime scene in Birmingham, his grip on his tape recorder changes. (00:11:30)
Character mistake: In one of the National Tattler headlines, the word "pursues" is misspelled "persues". (00:52:15)
Chosen answer: He figured out from evidence at one of the crime scenes that the Tooth Fairy drives a van. Graham noticed that at one of the houses, the Tooth Fairy knew everything he had to do and bring with him and at the other house, he didn't know about the new lock on the door. He concludes that this is because the Tooth Fairy got his information from the same home movies that Graham was watching. Once the films were traced to the lab where Dolarhyde worked, it was easy to link them back to him as the only person who'd had access to both families' videos and also drove a van.
Captain Defenestrator