When the Germans mobilize next to the reservoir before attacking the gypsies, there are 10 of them. But the number of Germans killed in the attack is 16-18.
At 23:20, as Saunders walk into an ambush by the gypsies, in the distance you can see a very tall palm tree. There are no palm trees in France or Europe.
At 22:49 you can see someone's shadow moving in the lower left corner. Possibly directing Ricardo Montalban, as he looks in the same direction as the shadow.
When Saunders and his men are shooting at the German jeep, as the jeep is seen driving away from the camera, the shadow of the camera and the camera operator are visible on the ground behind the jeep.
At approximately the 3:50 mark, when Saunders comes back to tell the others what's going on, something is moving around for a few seconds at the upper right corner of the screen, probably a microphone.
When Saunders gives McCall the German maps, he address him as "Call".