Revealing mistake: Several maps of Europe shown in the film have Germany divided into East and West, and show national borders from 1945 onwards.
Revealing mistake: In the beginning of the movie when the child is trying to remove the ring from a dead American soldier it is obvious that he is pulling on the finger and not the ring.
Revealing mistake: In the scene where a child is seen stealing a ring from a dead soldier's finger, the soldier's arm is visibly moving and twitching.
Revealing mistake: When Patton is inspecting the barracks at the beginning of the movie he swipes a picture of a "calendar girl" off the wall. If you look there are a number of scrapes already on the wall. There were obviously a number of retakes.
Revealing mistake: In Patton's office with Generals Truscott and Bradley, Patton lies down on a bench which is almost in the middle of the room when showing all three officers. However, the closeups of Patton lying on the couch shows the couch up close to a wall.
Answer: "The front" means the front line, i.e., where the enemy is being engaged. He's saying that since the soldier isn't physically injured, he should be fighting, not (as Patton sees it) being a coward and shirking his duty.