The Shop Around the Corner (1940)

Continuity mistake: When Mr. Kralik and Ms. Novak are carrying boxes out of the stock room after an argument, Mr. Kralik has 5 boxes in his pile. The shot changes and he now has only 4 boxes.

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Alfred Kralik: There might be a lot we don't know about each other. You know, people seldom go to the trouble of scratching the surface of things to find the inner truth.
Klara Novak (Miss Novak): Well I really wouldn't care to scratch your surface, Mr. Kralik, because I know exactly what I'd find. Instead of a heart, a hand-bag. Instead of a soul, a suitcase. And instead of an intellect, a cigarette lighter... which doesn't work.

Question: When Mr. Matuschek is recovering in the hospital and explaining to Mr. Kralik why he suspected him of having an affair with his wife, he mentions having received an anonymous letter warning him of his wife's infidelity. But who sent the letter? To all appearances, the errand boy Pepi seems to know everything that is going on, or nearly so. He doesn't know the cad is Mr. Vadas, but he probably has a good idea about what is going on from Mrs. Matuschek's phone calls. Still, the author of the anonymous letter to Mr. Matuschek is never revealed. Or is he?

Iain