Continuity mistake: While Barbara Bain is opening the puzzle box, Martin Landau is removing pieces of his disguise. First, he has a handkerchief in his right hand. Next, the handkerchief is gone and he is peeling off his left leather pocket, and the left leather lapel is already gone. Next, he removes his mustache with a handkerchief. Then, while removing the left leather lapel, the left pocket is back in place.