Visible crew/equipment: After Lucy goes into the bedroom with the newspaper and raises the window shades, when she walks around to Ricky's side of the bed, a crew member's shoulder/arm moves into the shot at the right side of the screen.(00:04:10)
Continuity mistake: When Ethel walks in while Lucy's vacuuming, Ethel has the folded newspaper under her arm and there's only small print on the paper, but after Lucy offers Ethel a cup of coffee now the headline can be seen on the still folded paper under Ethel's arm. Then, when Lucy unfolds the paper we see both the front and back page filled with pictures and the headline, but that area of small print which was seen in the earlier shots does not exist on either side.(00:00:40)
Visible crew/equipment: While Ricky and Fred are in the kitchen, when Ethel tells Lucy she needs her help getting Ricky for the club benefit, in the shots facing Lucy the shadow of crew/equipment movement is visible on the shutters to the right.(00:04:30)
Continuity mistake: When Lucy crawls into the New Neighbors' apartment she's startled by the stuffed bear head, and in the closeup of the bear head it's in front of a bare wall, but in the rest of the shots it's in front of furniture. Additionally, other things change as well between shots: the books under the bear, the hat, etc.(00:10:15)
Continuity mistake: After Lucy tells Mr. Merriweather that he's invited to the seance, when it cuts to Lucy unfolding the card table legs, note the couch behind her with one normal seat cushion on the left, but in the next wideshot there's an additional shorter cushion under the normal cushion. The small towel also repositions itself neatly on the couch.(00:11:55)
Visible crew/equipment: After the first shot of Mr. Merriweather trying to contact Tilly on his ouija board, when it cuts to him answering the telephone we can see the moving shadow of the boom mic, on the door to the right.
Visible crew/equipment: When Ethel's reading aloud from the book while Lucy's standing beside her in the living room, the shadow of a crew member can be seen moving around on the surface of the desk's back.(00:04:25)
Visible crew/equipment: When Lucy and Ethel are talking about going to the Copacabana, just as Lucy leans toward Ethel before her remark about catching more flies with honey, the second camera/equipment can be seen at the right side of the screen. The same thing happens later, when Ricky laughs at the idea that Lucy and Ethel will have dates, as Ricky walks over to Fred standing at the desk, camera/equipment is visible at the bottom, right corner of the screen.(00:01:45)
Visible crew/equipment: When Lucy decides to use the scissors to cut the TV wire on the roof, she and Ethel walk out of the kitchen, and at the start of the next shot we can see the end of the set wall and black cables on the floor, at the right side of the screen.
Trivia: On January 19th 1953, when Lucy Ricardo gave birth to Little Ricky on I Love Lucy, which 68% of U.S. TV sets tuned in to watch, Lucille Ball also gave birth to Desi Arnaz Jr. (in a planned C-section) on the same night. Newborn Desi Jr. was featured on the very first national cover of TV Guide. As a strange coincidence, on January 19th, exactly 43 years later, Marlee Matlin gave birth to her daughter at the same time that the evening's episode of Picket Fences was being aired, and her character on the show, Laurie Bey, was giving birth to a son.
Visible crew/equipment: After driving all day, the Ricardos and Mertzes stop by a run-down diner then end up spending the night in their shared cabin. While they're all in their beds, the vibration of the nearby train causes the Ricardos' bed to shakily slide towards the Mertzes and then back again. The wires attached to the Ricardo's bed are visible, coming from the hole at the bottom of the left wall, and the leg at the foot of the bed is set in a track attached to the floor, which keeps the bed on course.