Visible crew/equipment: When Trish picks up Jessica at the train station and her car leaves, filming equipment and crew members are reflected in the windows.
Visible crew/equipment: When Harry and Amos analyse the bathroom, the edge of the set wall is visible on the right side of the screen.
Programmed for Murder - S8-E18
Revealing mistake: In the outside shot of the hospital, just before Mort discusses his cough with Doc Hazlet, you can see a sign saying the hospital is located in Ohio, not in Maine. This isn't the only episode where this exact mistake is made.
Murder to a Jazz Beat - S1-E13
Continuity mistake: Jessica and Jonathan sit down to chat; he says, "Tastes and smells... worthy of kings and their consorts," and raises his hands. An instant cut later, from a different angle, they're lowered. (00:04:49)
Revealing mistake: When Jessica visits the basement, there's plenty of light everywhere. She then turns off the light, but there's still plenty of light. However, when Adam Frobisher shows up half a second later, the whole place is now in darkness to allow for all the mystery and the intrigue.
Murder in the Afternoon - S2-E3
Visible crew/equipment: When Jessica and the Lt. leave for the police station, filming lights, equipment, and a crew member are reflected in the windows.
Revealing mistake: When Emma hits a man using the flower pot, Angela Lansbury's stand-in is a much younger stunt double.
Visible crew/equipment: When Henry and Jessica are reading the resignation letter, state lights are reflected on their glasses.
Funeral at Fifty-Mile - S1-E22
Visible crew/equipment: After Jack's graveside service, Jessica, Mary, and Art walk back to the red pickup, and while they're standing there talking, the mic pops up into view in front of Mary. (00:04:40)
Funeral at Fifty-Mile - S1-E22
Continuity mistake: Carl arrives at the funeral in his RV and then heads to the house. When he arrives, it's a noticeably different model. The door's moved, the front right window is now segmented, and rails have appeared on the roof.
Continuity mistake: When Jessica limps into Milton's car, she holds onto the door. A shot later, her hand is away, and it's Milton's hand instead holding onto the door.
Continuity mistake: When Jessica (a stunt double) is knocked down, her left arm is under her body with her bag in front. An instant cut later (now Angela Lansbury), her arm and bag are behind her back.
Revealing mistake: When Jessica is knocked down by the kids, she is replaced with a younger stunt double.
Continuity mistake: When Milton picks up Jessica at the airport, her bag is hanging over her right shoulder. A shot later, she is holding it with her left hand.
Continuity mistake: The pad where the knife is stabbed protrudes under the writer's shirt.
Revealing mistake: When Miguel tries to sail away, Jessica runs towards the shore. When she enters the water, Angela Lansbury is replaced with a thinner and younger double.
Revealing mistake: When Santana is killed, a rectangular pad where the arrow was stabbed protrudes under his shirt.
Murder in the Afternoon - S2-E3
Continuity mistake: When Jessica is in the Lt.'s car, he scolds her, signalling with his index finger, which swaps to an extended hand an instant cut later, which is suddenly lowered yet an instant cut later. The way he holds the car keys also changes.
Murder in the Afternoon - S2-E3
Continuity mistake: The doctor steps in and calms down the actor while placing his hand on his shoulder. A shot later, his arm is lowered.
Funeral at Fifty-Mile - S1-E22
Other mistake: In the end credits, Jesús is misspelled Hay-Soos, phonetically.
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.