Plot hole: The police came in after the murder to find Laura on the bed and took her lover to jail. But in the plot, the body of Laura was never found until they dug her up.

Plot hole: When Walter uncovers the skull in the makeshift grave, he and his son immediately leave and call 911 on an emergency street phone, only to find the skeleton is gone when they return with the police. In less than 30 minutes, the entire unarticulated skeleton (all 206 bones) has been completely dug up and removed by another person. The bones were not lying in light, loose soil, but had been embedded in tightly compacted dirt for years. Nearly every piece would have to be individually extracted with a tool, which would take hours, not minutes.

Factual error: Right after Walter has the nightmare about killing his wife, he wakes up and turns around to see the alarm clock show 11:12. The clock makes a flipping sound when it switches to the next minute, just like those alarm clocks from the 1980s that have those little numbered plastic cards inside. However, it's a digital alarm clock and they do not make such sounds.

Continuity: In the scene where Walter is imagining himself killing his wife, the bed sheets change from silver to red momentarily after he wakes up.