The Dragons teeth of the Siegfried line are not shown as they really were (and in numerous places still are today). 1) In the movie the line is built with four rows of teeth. In reality the line is built with five rows. 2) The teeth are in reality not made in one size as shown in the movie, but in 3 different sizes, where the first and last rows contain the biggest pillars, the middle three are middle sized, and woven in the last row you can find the smallest. 3) The rows are not placed exactly behind each other. If you would see them from above, you would see an angle in the middle. 4) The rows of pillars are also not built in one line. If you would look over a row from the side, you would see a zigzag of pillars. 5) The pillars in the movie are too close to each other. In reality, the area between two pillars is so big, you can park a car between them (as is done by the author of this comment on numerous occasions).
When assaulting the 88s, the two men were using M2 flamethrowers. The burn time on these flamethrowers was 7 seconds, but are pictured spouting flames for much longer.
The insignia of rank of the German sergeant leading his patrol is of a design not used by the German army.
Many of the uniforms and field gear items worn by the American soldiers are not of the type worn by the U.S. Army during World War II. They are probably Hungarian military issue, since the movie was filmed in Hungary.
The map used by the Lt. Col. at the company command post to show the Captain where they are to secure a river crossing on the advance to Schmidt is not standard U.S. Army issue, which were black and white, but a modern color version mounted on cardboard.
The bolt on Manning's Thompson is always shown being at the back of the gun, or "open". It would need to be forward and "closed" to work properly.