Much of the scene where Andie crashes Ben's "boys night" was improvised. Kate Hudson had the idea to toss the platter of veggies at the guys seated at the poker table. Donald Petrie, the director, knew she was going to do this but the actors in the scene were truly surprised.
Kate Hudson improvised plastering Matthew McConaughey with kisses during the scene where she introduces the new dog. This is why McConaughey looks genuinely surprised.
A lot of the scenes were improvised, e.g. the scene with the "family album."
There were an estimated $14,200,000 worth of jewels lent to the film.
Andie wears a Harry Winston diamond wreath necklace with an 84-carat yellow diamond pendant (called the "Isadora") attached, valued at approximately $5,280,000 and a pair of five-carat radiant-cut yellow diamond stud earrings worth approximately $125,000.