Continuity mistake: When Lynette sits down next to Claire on the bench at the park, Claire is wiping her hands with a tissue. Claire is not wiping her hands in the next shot, but in the shot after that, she is.
Continuity mistake: When Lynette introduces herself to Claire at the park, the strap on her handbag is on her shoulder. When the camera angle changes to behind Lynette in the next shot, the strap has gone, and in the shot after that, it is back again.
Audio problem: When the Stagehand says "Come on, you're up!" to Susan before she is about to go on the catwalk at Gabrielle's fashion show, the words do not match his lips.
Continuity mistake: When Zach is in Julie's bedroom, he says to her, "And they buried her, to protect me" and you can see that Zach has his hand on his cheek. When the camera angle changes to behind Zach in the next shot, he no longer does.
Continuity mistake: Before the fight between Helen and Susan at the fashion show, Susan has a flower in her hair. There is no sign of the flower when Helen tears off part of her wedding dress, but when Susan says "What?", the flower is back again.
Audio problem: When Susan is on the catwalk at Gabrielle's fashion show, Tom announces what she is wearing, but if you look in the background you can see his lips are not moving when he is speaking.
Continuity mistake: When John is speaking to Susan about his relationship with Gabrielle, Susan puts her hand on John's cheek, but in the next shot, when John's mother is looking out of her car, Susan can be seen with her hand on John's shoulder.
Continuity mistake: In the scene where Bree and Lynette are talking about nannies, Lynette is in the back seat strapping her baby daughter into the car seat. In the shot facing Bree, Lynette takes a baby toy lying on the back seat and hands it to her daughter, but in the next shot facing Bree, the toy is back on top of the seat where again Lynette hands it to her baby.
Audio problem: When Susan suspects someone might be in the house, the seduction music she has put on for Mike is drowned out by the score. When she accidentally hits Mike across the face, the score stops, but the music that was playing in the background has gone. The song in the background before now was music within the show, and it was loud enough to be heard around the house, so we should still be able to hear it.
Continuity mistake: When Bree is about to leave the hospital she picks her bag up with her left hand to put it on her right shoulder but when the camera angle changes she's put the bag on her left shoulder with her right arm.
Continuity mistake: When Bree is talking to Mike in hospital, the position of her roll neck jumper on her right shoulder changes constantly throughout the scene. In some shots it's rolled down, in some it is rolled up.
Every Day a Little Death - S1-E12
Continuity mistake: Bree arrives home carrying a package in her left hand and bags in her right. In the next shot, when her phone rings, the package is gone, the bags are in her left hand and she answers the phone with her right. (00:07:10)
Every Day a Little Death - S1-E12
Continuity mistake: When Gabrielle is eating fried chicken on the walkway, the bucket she is eating from mysteriously turns between shots.
Every Day a Little Death - S1-E12
Continuity mistake: When Edie throws the urn of ashes at Susan after she discovered Susan burned her house down, you can see that there is nothing on Edie's left shoulder, but when the camera angle changes to behind Edie in the next shot, her shoulder is now covered by her cardigan.
Every Day a Little Death - S1-E12
Continuity mistake: When Edie throws the container of Mrs Huber's ashes over Susan after she discovered Susan burned her house down, there is still some ash in Susan's hair and on her cardigan from a previous take.
Every Day a Little Death - S1-E12
Continuity mistake: When Edie is about to spray water on Susan from the hose, you can see that Susan is very close to Edie, but as the camera angle changes she is much further away.
Every Day a Little Death - S1-E12
Continuity mistake: When Lynette signs the clipboard at yoga, a close-up shows her signing it with her right hand, but in the next shot she is holding Penny with her right hand and signing her name with her left.
Every Day a Little Death - S1-E12
Continuity mistake: When Carlos pulls Gabrielle down to the sofa for a neck massage, he places the fried chicken bucket by his side on the sofa. When Gabrielle stands up and refuses to have a baby, the bucket has disappeared, and when we see Carlos leaning back on the sofa a few moments later, he has the bucket held in his arm.
Every Day a Little Death - S1-E12
Continuity mistake: When Gabrielle toasts to Carlos' return, the volume of champagne in her glass changes between shots.
Every Day a Little Death - S1-E12
Continuity mistake: When Edie gets the phone call, saying Mrs Huber was found, while she is at Mike's, you can see the cell phone on the table where she is sitting. When the phone rings, she reaches to nowhere with her right hand and you can still see the phone. Then the view changes and you can see her getting the call with her left hand.
Answer: Kayla was sent away in episode 16 (The Gun Song) in season 4, after falsely accusing Lynette of child abuse. She now lives with her grandparents - probably Nora's parents.
I'm curious why we never see her again, why she never talked about, and why Tom never mentions visiting her.