Possible plot hole? (Spoilers of course)
In rewatching the film, I took note of the scene where they introduce Hugo Stiglitz and show him killing the Nazi officers. They show a picture of him in what looks like a military newspaper and they also show pictures of the officers who were killed by him.
Based on that, isn't it pretty likely that any one of the German military who were in the basement tavern scene would have recognized Stiglitz? Especially the Major who ends up sitting right next to him. I mean, any traitor who did that kind of damage to the German side by killing that many officers would have had a lot of infamous notoriety and I believe he would have been spotted since they had a clear picture of him and he wasn't disguised in any way.