Continuity mistake: When Margrete is searching her apartment for Linda with her pistol, she goes from holding it with one finger on the trigger to having two fingers on the trigger. (01:50:40)
Suggested correction: Margrete doesn't instantly go from one finger to two fingers on the trigger; it's over twenty seconds later. Your two pictures are not an accurate representation of the actual onscreen continuity. Margrete turns off the bathtub faucet. She walks through the bathroom shown in the top picture (01:50:06), and the camera then pans toward the window and pans back to Margrete. It then cuts to a shot of the parlor area, then cuts again to Margrete as she pulls the gun's slide back. The next shot shows Linda grabbing the scissors. Then, finally, in the next shot, Margrete hears Linda, so she turns her head with her two fingers on the trigger, shown in the bottom picture (01:50:32).
Continuity mistake: Near the end of the movie, when Ed Leland is about to enter the Customs Office, the insignia on his hat is intact, but when he enters it has disappeared.
Continuity mistake: When Linda Voss and the children return home from the city (after the bombing) and are greeted outside by Franze-Otto Dietrich, Linda has her watch on her right wrist (as she is a lefty). As Dietrich and the children are heading into the house, you see a close up of Linda checking the time on her watch and it is on someone's left wrist. When she subsequently goes into the basement to look around, the watch is back on her right wrist again.
Continuity mistake: In the scene in Margrete's apartment, when Linda and Margrete are struggling for the gun, Linda's hands go from being bloody, then they are perfectly clean, then they go back to being bloody again.
