The agony and the 'ex'tasy - S4-E1
Revealing mistake: When Charlotte arrives at Carrie's apartment to pick her up, Carrie is in the shower. As Charlotte walks towards the bathroom, there is a clear shot of Carrie showering. Sarah Jessica Parker appears to be wearing some sort of minimal tan colored undergarments, to protect her modesty while filming. (00:24:20)
The agony and the 'ex'tasy - S4-E1
Continuity mistake: When Carrie is showering after being stood up at her party she is not wearing mascara as she stands with her face under the water, then as she opens the curtain to talk to Charlotte again there is no mascara. She puts her hands briefly over her eyes and when she takes them away, mascara is visible all over her eyes and cheeks.
The agony and the 'ex'tasy - S4-E1
Plot hole: In the closing scene in Big's car, he asks Carrie how her birthday was, then says, "So how old are you?" She replies, "How old are you?" And they coyly don't reveal their "age box." But they have known each other for 3 years/seasons at this point - dated on/off for 2 years, had an affair, and are just friends now. There is no way they wouldn't know each other's ages. This exchange only existed to benefit the plot of this episode - it makes no sense given how long they've known each other.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: When Miranda bumps into Cheryl on the street, she holds out her arm and starts shaking it like she is shaking Cheryl's hand but when the shot changes to Cheryl, she hasn't even taken Miranda's hand yet.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: When Carrie holds the "Dear single" letter, the envelope is below the paper, but in the close-up it's behind the upper part of the letter.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: Charlotte holds her notepad while Trey asks her to take off her panties. Then the notebook swaps hands.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: Carrie grabs the "Two souls" invitation with her right hand, but a shot later she holds it in her left hand.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: During credits, when the girls are walking, Carrie holds her invitation from the lower left corner in one shot but from the middle part in another.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: Big's tie is tucked inside his jacket, but loose in the rest of the shots.
The agony and the 'ex'tasy - S4-E1
Continuity mistake: Inside Big's car, Carrie lowers her cup, but a shot later it's raised.
The real me - S4-E2
Continuity mistake: As the group are discussing Samantha's nude photos in the restaurant, a salad Miranda has ordered arrives at the table. Just after Carrie says "that we know of" you can see the waitress place both the salad and a ramekin of dressing onto the table from behind Miranda. The shot then cuts to the front and the waitress is shown putting the ramekin down for the second time.
The real me - S4-E2
Character mistake: Miranda, Charlotte and Carrie are sitting in the cafe waiting for Samantha, when she runs in late, armed with her photos. Just before she'd arrived, a waitress had come to take their order - Carrie ordered a drink but nobody ordered food, but when Samantha offers the photos to look at Miranda says something like "But only till the food arrives." They didn't order any food.
The real me - S4-E2
Continuity mistake: When Oscar tells Carrie that her hair is all wrong, he moves his left arm up and down and signals her, but from the front angle his arm is lowered and doesn't move an inch.
The real me - S4-E2
Continuity mistake: When Oscar tells Carrie about looking like a whale, his assistant is either by his side or behind him. This changes back and forth.
The real me - S4-E2
Continuity mistake: When Oscar shakes the underwear at Carrie, the position of his thumb holding the clothes hanger changes between shots.
The real me - S4-E2
Continuity mistake: When Carrie talks about Cindy's beauty Mark, the photographer is drinking wine, but the glass disappears in the angle shot from behind.
The real me - S4-E2
Visible crew/equipment: When Carrie shows the Cindy Crawford picture, the filming crew plus lighting screens on the side and on the ceiling are reflected on the bottle.
The real me - S4-E2
Continuity mistake: When Sam shows her picture to the store clerk, two huge lighting screens are reflected on the glossy paper.
The real me - S4-E2
Continuity mistake: When Sam arrives at the framing store, the position of the handles of her bag changes between shots.
The real me - S4-E2
Continuity mistake: When Sam talks to the framing store clerk, his hand is first on the notepad, but then jumps to being on the table.