A Cat in Paris isn't heavy handed with messages, but there are a few that stand out: People are complicated, a thief may actually be ethical, and a seemingly kind woman might actually have less honorable intentions. Communication is beyond the verbal: Zoe can get her point across even without speaking. Family is ultimately more important than work.
The movie is filled with flawed characters: Nico is a thief but an honorable one. Jeanne is a fantastic detective, but she she's so overworked that she isn't always there for her daughter, Zoe. People who seem good are actually villainous. Zoe is mute but has so much to say with her face and her actions.
Although none of the violence is without consequence, there are several suspenseful action sequences, one of which results in a death. A character is accused of slowly poisoning people with her "perfume." A crime boss is a terrible shot and can't kill a spider with his handgun. The central cat kills lizards, and it's considered a good thing. A character falls to his death after a hallucination that brings Notre Dame Cathedral gargoyles to life in a scary manner. Zoe's mother Jeanne has frightening nightmares about the man who killed her husband; she imagines him as a menacing giant octopus. A barking dog is squashed but then is shown barking again.
Costa and Claudine are affectionate with each other, and he calls her his pet. A male nude statue has a penis.
Mostly insults: "Son of a ...," "mangy cat," "stupid."
Drinking, Drugs & Smoking
It's France -- there's Champagne and wine at a dinner scene, and one character smokes a cigarette.