After the baroness pulls a gun on the robber, he distracts her by kissing her, whereupon she drops the gun on his foot. She runs to the other side of the room with the robber limping after her. The gun is on the floor as he starts toward her; when he reaches her he's holding it.
When the police let go of the rope they are pulling Johann Christian Lenz of the Vienna Protection Agency out of the well with, he doesn't immediately fall but slowly drifts back down into the well.
After the robbery, when the police are questioning the victims, all the men refer to the weapons used in the robbery as revolvers, when all the robbers carried automatics. (In fairness, the victims are not authorities on weapons and may well have been using the word as a generic synonym for "gun".)