When in the restaurant, Regina and "Alex" kiss, her head is tilted to her right and his to his right, a split second later, her head is tilted to her left and his to his left, they did not have enough time to change.
After Regina is attacked by Zadapec in the elevator and Joshua pulls him off her, he tells her to take the elevator up and you see the elevator start going up. However, the next camera shot from her view is with the elevator going down.
When Regina is in the elevator after "Joshua" saves her, he sends her up in the elevator, but when we see Joshua scuffling with the attacker from Regina's point of view, the lift is going down, we know this because we see his shoes disappear from the top of the screen, if she was going up, we would see his head or shoes disappear from the bottom of the screen.
At the airport in Paris, Joshua says to Regina that they are now in another country. However, their only previous meeting was in Martinique. Whilst located in the Caribbean, Martinique is an overseas department of France. Thus, they are still in the same country as where they met before.
Using a mint stamp by applying an inappropriate postmark, or even simply spoiling the adhesive by attaching it to a piece of paper, can reduce the value considerably, maybe even making the item totally worthless.
Regina and Joshua take a train from Paris' Gare du Nord station, bound for London's Waterloo station. The rail equipment used carries the blue and white TGV livery, the French high-speed line that runs domestically in several directions from Paris. However, only yellow Eurostar trains run from Gare du Nord through the Channel Tunnel to England.
When Dyle is given the poison food in the prison by Charlie's mother at the end of the film, you can hear Dyle's screams, yet if you look closely as the camera follows Charlie's mother, you can see a glimpse of Dyle standing in the same position he was when given the food instead of writhing on the floor, as one would expect and as the sounds intimate.