Corrected entry: Carrie claims to have never tasted espresso before when Petrovsky buys her a machine, but in Season 1 episode 3 ("Bay of married pigs") she is having lunch with some married friends, and they set her up with a friend. They get on well, and the voiceover says "two espressos and a tiramisu later" and we see Carrie drinking her espresso.
Corrected entry: In the episode where Carrie and Berger are still trying to set up their first date Carrie sees Berger. Berger stops at a payphone and uses it. Carrie runs away and calls Berger at another payphone. What phone did Carrie call? If Berger had a cell phone, why would he be using a payphone?