At the end, it was snowing. Clearly digital as not only snow wasn't on both leads, but when it was camera switching between frames there was snow than wasn't snow, then again is snowing and so on.
Janice calls the cat food company "Le chat oui mange bien" instead of "Le chat qui mange bien."
Around 2/3 of the movie, Kat was shown to drive Toyota Avensis which is simply impossible. Toyota produced Avensis in its UK factory and sold exclusively just in Europe. It was basically smaller Camry, but still bigger than Corolla sedan. However, the movie was shot in Bulgaria so it's "logical".
She describes her internet date as "perfect," by being blond, blue eyed with a dimple. During her dinner date, it's obvious he's a brunette with dark eyes. For some reason even though she's a dog lover, she never bothered to check whether he had an interest in dogs. Turns out, he doesn't like dogs at all. For someone who has such an ideal of perfection, she obviously didn't do her homework before selecting her so-called perfect man.