The envelope and passport change their relative positions in Laure's hand between shots during the climactic scene.
In the end, Laure falls on her left side. Next, she's on right side.
The blood on Black Tie's shirt in the woman's bathroom doesn't match the shirt when he is released from prison.
In the pan from Bardo's balcony to the Cafe table, the "Deja Vue" poster is being rolled up before the "Gala" poster is installed. When it cuts back to the poster kiosk, the "Deja Vue" poster is crumpled, as if it was never rolled at all.
At 1:22:32, Laure's and Nick's faces are suddenly much closer between shots.
It's not possible to record with the Sony MiniDisc recorder used in the movie without using an external microphone.
All French/European bath tubs are equipped with an overflow.
Following the initial heist, Black Tie says, "The bitch double-crossed us," in French. But the subtitles translate it as "The bitched double-crossed us".
Seven years later, the blood on Black Tie's shirt is still red instead of having dried into a maroon/dark brown color.
There are no schools where pupils attend in uniform and are accompanied by nuns in 2000's Paris.
There is no reason why someone who has decided to kill themselves would play the Russian Roulette, especially several times in a row.
The film supposedly takes place at the 2001 Cannes Film Festival, even though the premiere that was recreated for the opening of the film is for East/West (1999), which, had it been shown at Cannes, would have been shown in 1998 or 1999. The real director Régis Wargnier and the star of the film Sandrine Bonnaire appear as themselves.
At 30 minutes, the TV host's lips do not match the audio in French.
When Black Tie and his partner are running onto the bridge near the end, their shadows are visible. Next to them a third shadow is visible - the Steadicam operator.
Just before Bardo enters his apartment, with the computer showing "new e-mail", the camera's shadow moves over the paper cutter.
The complicated scheme is based on the diamond-wearing lady not detecting a man in a black suit crouching near the semi-transparent wall.
The passport and plane tickets are visibly displayed on the floor. Surely, the mother, who has the keys to the house, would have noticed the items when arranging the flowers.
Laure saw Nick taking pictures before the exchange and yet she does not hide.
Lily writes that she lost her passport and ticket. She did not even bother looking for them.
An email, sent in the afternoon, instructs Nick to meet Laure "at 2 am this morning". It should read "at 2 am tomorrow" or "at 2 o'clock tomorrow morning".
The "bodyguard" does not enquire why his colleague is not coming back after a few minutes though he has radio communication available.
The "bodyguard" does not react at men's shoes pointing out the women's cubicle and a silhouette hiding being the door.
The "bodyguard" does not hurry to get into the ladies room when the chest piece alarm rings.