Visible crew/equipment: As Dennis enters the house through the window, a set light is reflected in the glass. Wider shots of the location show no lights matching those reflected in the nearby glass, confirming that the reflections originate from the filming equipment rather than from any practical sources on set.
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.
Jack & Bill - S6-E5
Revealing mistake: In the toilet scene, when Max slams the terrorist against the wall, he is replaced by a very obvious stunt double with longer hair and a noticeably larger build.
Continuity mistake: The figure skater is swimming in the pool, yet a minute later she's sitting there with dry hair.
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.
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 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.
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.
Revealing mistake: When Jessica is knocked down by the kids, she is replaced with a younger stunt double.
Visible crew/equipment: When Milton arrives at the airport, the filming crew is reflected in the glass on the right.
Visible crew/equipment: When Sir John Landry walks towards the fireplace before Jessica unravels the mystery, stage lights are reflected on Jessica's glasses.
Visible crew/equipment: At the beach, when Miguel jumps in the helicopter, two filming lights are reflected on the windows.
Continuity mistake: Patti and Brian enter the alley, talk to the card scammer, and keep on walking. From a different angle, they're metres behind, entering the alley again.
Continuity mistake: When Grady introduces the understudy, he puts his arm around her shoulders. A shot later, his arm is away.
Revealing mistake: When Jessica is meeting with Congressman Dan Keppner, there are two windows with the Capitol building behind. One can see it's a painted backdrop, most noticeably the window on the left with the garden view.
Revealing mistake: All of the exterior shots of Jessica and Hagarty are wide shots with very obvious stand-ins. Jessica is thinner and younger, while short-haired Hagarty's double is younger, chubbier, and has long hair around the nape.
Answer: Because during Season 6, Lansbury wanted a lighter workload and to do other projects. So they had her just introduce and sum up the episode.
Rob245