Twenty-something girls vs. thirty-something women - S2-E17
Deliberate mistake: In the scene at the beach party, when Carrie brings everyone beers, Miranda says "There's so much foam, I could ski on the head," but the cups are tipped toward camera and you can see there's no foam at all.
Hot child in the city - S3-E15
Deliberate mistake: Whenever Charlotte and Trey are shown sitting on the therapist's couch, Charlotte is considerably taller than Trey. They are both sitting on exactly the same surface, so there is no logical reason for this. In reality, Trey is actually taller than Charlotte. She should not be sticking up higher than him on the couch.
Deliberate mistake: The second time they show Samantha having sex on her 'rolling bed', you can see that the guy is too far above her to actually be having sex with her. They are too far apart, probably to make it less awkward for the actors. (00:12:05)
Deliberate mistake: At RAW, just as the host starts showing the girls to their table, there is a lady at the bottom right corner of the screen whom you can see is only pretending to eat her food. She puts it up to her mouth, pretends to take a bite, then moves it away again.
Twenty-something girls vs. thirty-something women - S2-E17
Deliberate mistake: When the girls are on the beach, Carrie's narration says "It was a sunny day", but instead it is a grey and cloudy one. Surely the filming schedule was tight and they had to cope with that day's weather.
Answer: Yes, it is.