Factual errors: In the first set of end credits listing the stars, Brian F. O'Byrne's last name is spelled "O'Bryne"; it is spelled correctly in the second set, listing the entire cast.
Revealing mistakes: When the Jews are ushered from the changing rooms to the "Shower" a women with a bikini top is visible for a moment in the background.
Factual errors: The movie mentions the rebellion taking place in 'Number One' and 'Number Three' Crematorium in Birkenau. In reality these crematoria were numbered 2 and 4 (the number 1 crematorium was in the main camp Auschwitz 1). The unit working in Crematorium 2 was known as Kommando 1, however.
Factual errors: The movie suggests that two crematoria were destroyed during the rebellion. In reality only crematorium 4 was destroyed.
Factual errors: Overall shots show four crematoria side by side. In reality crematoria 4 and 5 were located quite a distance away from the other two.
Factual errors: The sonderkommandos mounted the uprising in a hurry. The krematorium IV Kommando rebelled after they knew they were about to be liquidated. They used only blunt weapons and self made grenades and set the krematorium 4 on fire (only one). The rebellion wasn't planned from the start.
Factual errors: After the men did set the krematorium 4 on fire they tore down the fences and fled into the woods. They barricaded themselves in a barn where SS caught them. They were burned alive inside the barn.