I, Darrin, Take This Witch, Samantha - S1-E1
Continuity mistake: When Darrin collapses after Samantha zaps him the drink, in the next shot the glass is on the table with the straw across the top.
It Takes One to Know One - S1-E11
Continuity mistake: When Larry tells Darrin that he is going home, the blinds behind Darrin are shut, however in the close up of Darrin, the blinds are open.
Open the Door Witchcraft - S1-E28
Deliberate mistake: Sam and Darrin are "trapped" in the garage; however, you can see a side door.
It Shouldn't Happen to a Dog - S1-E3
Continuity mistake: Samantha's hair goes from neat to messy and back again during the chase scene in the alley.
I, Darrin, Take This Witch, Samantha - S1-E1
Continuity mistake: Darrin's hair is messed up from the windstorm. When he sits down, his hair in neatly combed back as when he first arrived at the dinner party.
Which Witch is Which? - S1-E24
Continuity mistake: Sam gets fitted for a "new" dress that she wore in earlier episodes 7,10,and 13.
A Vision of Sugar Plums - S1-E15
Factual error: Samantha looks out a back dormer window to see Darrin in the front yard.
Be it Ever So Mortgaged - S1-E2
Revealing mistake: When Gladys is looking through the window, you can see part of the facade cross bracing.
I, Darrin, Take This Witch, Samantha - S1-E1
Audio problem: When Samantha and Darrin are at his ex-girlfriend's house for dinner, Samantha is doing all kinds of things to sabotage the dinner, even making a gust of wind come through the front door thus blowing the ex's wig off. The ex girlfriend is screaming but the screams don't match up to what her mouth is doing.
Continuity mistake: In the opening scene, Bertha (Later Aunt Hagatha) puts her cookie on her plate next to her cup. In the next shot it disappears.
A Nice Little Dinner Party - S1-E19
Continuity mistake: The train shown is pulled by four diesel locomotives, "A" unit leads with two "B" units sandwiched between a second "A" unit. When Mrs. Stevens pulls the emergency stop cord, which would not likely be on a long distance passenger train, the locomotive shown doing an emergency stop is a steam one. Not to mention that by the time of this episode steam engines were obsolete, and less likely to have been employed, especially in passenger service.
And Something Makes Three - S1-E12
Other mistake: While Gladys Kravitz is standing in front of her house, which is across the street from the front of the Stephens' house, Gladys sees the Stephens' backyard just as Sam zaps a swimming pool and then zaps it away, but since the Stevens' backyard is located behind the house where the living room and dining room are, this would be impossible even for nosy Gladys Kravitz.
Red Light, Green Light - S1-E23
Continuity mistake: When Dave sees Darrin's ad for the community meeting, he suggests a couple of changes, one of them being to add a line saying "and bring your friends". But the ad was shown in close-up shortly before Dave's arrival, and there was already a line saying "Be sure and bring all your friends". (00:13:35)
Driving is the Only Way to Fly - S1-E26
Visible crew/equipment: As Harold and Samantha drive away from the traffic jam, part of the camera rig is reflected in the side window of the car. (00:16:00)
There's No Witch Like an Old Witch - S1-E27
Visible crew/equipment: As Samantha helps Aunt Clara out of the closet, as Samantha says, "Don't go 'way!" the boom mike's shadow becomes momentarily visible at the top of the screen. (00:02:00)
Continuity mistake: The shaving cream smears on the mirror are different in the close-ups than they are on the wider shots. (00:04:25)
Visible crew/equipment: When Abner comes over to the Stephens' near the end to say Gladys' problem has got worse, just as the door is closing a crew member's hand can be seen near the Bob ensuring it closes. This is just before the shot goes to Darrin.
Samantha Meets the Folks - S1-E14
Visible crew/equipment: When Aunt Clara's satchel and umbrella are "floating" up the stairs the shadow of the boom pole making the magic is visible above the Menorah at the top of the wall.
Be it Ever So Mortgaged - S1-E2
Continuity mistake: After Darrin arrives at the house and Sam goes outside to greet him and Endora disappears from the living room, there is no carpet runner/protector on the carpet leading to the patio door and the folding style patio door blinds are totally folded. When Darrin and Sam come into the house looking for Endora the carpet runner is there and the patio door blinds are partially open.
I, Darrin, Take This Witch, Samantha - S1-E1
Visible crew/equipment: At the dinner party and after a gust of wind, Samantha uses her powers to close the front door. As it shuts, the shadow of the moving camera is visible on the wall on the right-hand side. (00:22:23)
Answer: The original diamond and white gold heart necklace was given to Elizabeth Montgomery by her then real-life husband, William Asher, who also directed the show. She wore it in nearly every early episode. When the necklace was lost or stolen about mid-way through the series, Montgomery had two replicas made from rhinestones. She wore either one of those for the rest of the show's run.
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