Temple takes his boots off to swim across the water to try to get at the Germans. When he gets to the top of the building, we see him walking across the roof and it is obvious that he has some kind of shoes on under his socks. He can be seen wearing a shoe on his right foot after he destroys the machine gun and he sits down with his right leg hanging over the edge of the roof.
The machine gun that the German soldiers are using is actually a British issue Vickers .303 caliber water cooled, belt fed machine gun.
Pvt. Crown describes his profession as a "DJ". This show is set in France in 1944. And while the first recorded use of DJ as a job description for someone who plays music on the radio was in 1935, by Walter Winchell. Winchell was a radio commentator in that era. The first true DJ using two turntables was in 1947 in England. The term did not even begin to be used with any regularity until the 1950s at "sock hops".
But the 1960s is where the term became ubiquitous.
When Saunders and Crown are pinned down, Temple asks what he can do. Saunders scoffs back at him, "What can you do?", but his mouth doesn't move.
When Temple is hanging by his hands on the roof's rain gutter, one end of it breaks away and we see the cable that lowers him safely.
Temple attempts to sneak up on a German machine gun nest by climbing onto the roof of a nearby building and tiptoeing along its crest. However, he's also silhouetted against the sky and, if it weren't Hollywood, he would be an easy target. He should have known better than that and instead walked below the crest and along the reverse slope where he would be unseen and protected from enemy fire.