Factual error: When Darcy leaves England and goes to New York City. He steps out of the terminal and a big banner reads Welcome to New York. Then he stops by a speed limit sign that said 15 miles per hour. Problem....that sign is red with white letters. The U.S. speed limit signs are not that color. Therefore, that airport was NOT in New York and they were saving money on production. I guess the banner helped.
Other mistake: When Bridget and Mark kiss at the end, he puts his coat round her. The coat is huge! It's obviously specially made because before it wasn't as big as that.
Continuity mistake: There are two types of string used in the blue soup scene - plasticky type that florists sometimes use for the blue stuff, then ordinary string for when the dye has come out.
Continuity mistake: During the fight between Mark Darcy and Daniel Cleaver, when Daniel pushes Mark through the restaurant window, the text on the window changes in font, colour, and content. The first window features burgundy text when close up on the restaurant before and while the two go through it. However, the second window text is cream coloured and shown in wide shots with the restaurant in the background and after Mark and Daniel have broken it.
Continuity mistake: When Cleaver is knocked-out on the floor, the amount of shattered glass around his head increases between the close-up and wide angle.
Continuity mistake: During the car ride scene with the scarf flying, the suitcase behind Bridget changes positions between shots. Before the scarf flies it's on the right side, but after the scarf flies it has moved to the center of the seat.
Continuity mistake: When Mark returns from the States, as he begins to kiss Bridget for the first time, from the camera shot behind him, his head is angled to the right. From the shot behind Bridget, it is angled to the left.
Continuity mistake: When Bridget has been invited to the dinner party (the one with all the couples) she has a drink - to start with it is two thirds full, next shot half full - she hasn't drunk any because she is talking next scene and it's two thirds full again.
Continuity mistake: When her mother comes back home, the camera switches between a view of her Mum where you can see the back of her Dad's head, and the reverse shot. When she's saying "you must pay more attention to me", after she says "me" her mouth is open when you see the back of her head, but after it switches and we see her from the front, her mouth's shut.
Continuity mistake: After Bridget and Daniel Cleaver go out for a meal, they hail a cab outside the restaurant. The road is Shad Thames and is locked by gates at every exit every night and pedestrianised, so a) How did they hail a cab from a locked road? and b) Where could it take them to?
Answer: I'm pretty sure you can assume she's talking about anal sex, which is still technically illegal in a number of countries.