When Paul Rusesabagina goes to the Hotel Diplomat to get the scotch for the Rwandan general the bottles of Glenfiddich are rounded off. The rounded off style of bottles are a newer design, the ones in 1994 would have come to a point.
Someone said early in the film that the Hutu-Tutsi distinction was introduced by Belgian colonizers. In fact, the distinction had existed beforehand (e.g. King Kigeli IV of Rwanda was a Tutsi), but the divide had been less marked before Belgian rule.
Colonel Oliver's character refers to his subordinate Lieutenants as "Lew-tenant" pronounced the American way. As a Canadian, he would have pronounced it as "Lef-tenant". He does the same for several other words, intonating American-style, rather than Canadian-style.
When Colonel Oliver talks about the beginning of the negotiations, a photographer is seen in the front row shooting the speaker with a reflex lens. This kind of lens can not focus down to less than 3 meters as seen in the film and would be useless anyway because of an excessive magnification.
When Paul Rusesabagina sends his wife and children away in the UN convoy, Tatiana Rusesabagina is wearing an orange floral skirt prior to getting in the truck and before the truck pulls away, but after the truck pulls away as she is calming the children her skirt is gray.
When Paul Rusesabagina is first seen getting supplies for his hotel, at one point we see him with his arm brought up to his head, but when the camera angle switches, his arm is down. And then the angle switches again, and his arm is up again.
When Paul Rusesabagina and Tatiana Rusesabagina are embracing on the roof, Tatiana wraps her left arm around Paul's back and behind his right shoulder but in the next shot her left arm is pulled in tight against Paul's chest.
The other hotel where Paul Rusesabagina keeps a safe, has a sign calling it "Hotel Diplomat". As Rwanda was fully francophone in 1994, this particular hotel was called and spelled "Hotel des Diplomates".
The shoulder rank insignia of the Canadian Army Colonel in charge of the UN contingent is incorrect: The rank badge should include the word "CANADA" at the outside edge of the epaulet. He is also shown wearing shoulder board insignia which is more typical of a naval officer instead of a senior officer in the Canadian Army. He should have shoulder-mark insignia that slips over the shoulder straps.
In the last chapter, When Tatiana Rusesabagina is looking for the pictures of her lost little nieces, we first see the pictures with two question marks under it. Five seconds later, the picture is blank.