Murder -- According to Maggie - S6-E17
Visible crew/equipment: When Jessica introduces the story and walks toward the coffee table, a chalk T-mark on the floor becomes visible on the left as she sits down.
How To Make a Killing Without Really Trying - S6-E14
Revealing mistake: When Jessica enters Gordon Tully's office and looks around, there's a photo of him with Buddy Black. The picture is an awful, poorly done composite: the lighting on their heads doesn't match the rest of the image, the head sizes are out of proportion with the bodies, and the overall light direction is inconsistent.
Audio problem: At Jessica's stockbroker's office, there's a thick rug on the floor, but some footsteps sound as if they were on hardwood.
Visible crew/equipment: When Jessica and Seth are out in town searching for the kid, the film crew, equipment, lighting screens and even a C-stand are reflected all around them. (00:29:14)
Continuity mistake: Kevin lifts a piece of banana bread to his mouth, but from the opposite angle, his hand is suddenly lowered. (00:13:17)
Visible crew/equipment: Set light reflected when Danny crashes his pickup.
Revealing mistake: When Danny recounts crashing the pickup and breaking the tail light, you can hear the light shatter when he hits the tree - but it doesn't actually break. In the next shot, however, the tail light is suddenly smashed.
Visible crew/equipment: When Frank is put in jail and the camera moves around the iron bars, the camera's moving shadow can be faintly seen on the column.
Visible crew/equipment: When the episode ends and the sheriff laughs, a large lighting screen is reflected in his right lens.
Visible crew/equipment: When Marcia gets back into the car, a boom-mic operator is reflected in the door.
Visible crew/equipment: When the episode begins and Jessica recounts the story, several set lights are reflected on the coffee pot.
Town Father - S6-E11
Visible crew/equipment: In almost every scene involving Dr. Seth, set lights are reflected in his glasses.
Town Father - S6-E11
Revealing mistake: When the two men knock on Jessica's door to inform her about the murder, the landscape behind them is a painted backdrop.
Town Father - S6-E11
Visible crew/equipment: When Horton lets Jessica and the sheriff into his house, a large set light is reflected in the glass panels of the door.
How To Make a Killing Without Really Trying - S6-E14
Continuity mistake: When Jessica meets the golfer, the glove on his left hand is missing in the front shots, but reappears in the reverse angles - where he is actually seen taking it off with his other hand.
Continuity mistake: When Ballinger's daughter is unpacking her groceries, she places a bunch of carrots and two styrofoam trays on the right side of the counter. When she unpacks the bread, the trays and carrots have suddenly shifted to the left, right next to the fridge. As she walks to the table, the shot is the first one with the food away from the fridge and the bread is gone.
Answer: In a flashback scene, it was shown that he had a violent temper, so it stands to reason that he finally killed her in a fit of rage.