Revealing mistake: When Walther Matthau is making sandwiches for his poker pals (during the movie's first poker game), Matthau drops a slice of bread on the kitchen floor. If you look at his hand, you'll see that he flicks his thumb to make the slice of bread fall.
Continuity mistake: In the opening sequence, Felix (Jack Lemmon) goes into the Metropole Cafe. One of the people he passes as he enters is a young woman with a thin face and very distinctive nose and eyes. He goes in, has a drink, hurts his neck, and leaves. As he is leaving, the camera pans the band and go-go dancers. One of the dancers is the young woman who had just left as he was entering.
Other mistake: In the opening credits, the copyright year is shown as MCMXLVII (Roman numerals for 1947), when it should be MCMLXVII (1967).
Oscar Madison: I can't take it anymore, Felix, I'm cracking up. Everything you do irritates me. And when you're not here, the things I know you're gonna do when you come in irritate me. You leave me little notes on my pillow. Told you 158 times I can't stand little notes on my pillow. "We're all out of cornflakes. F.U." Took me three hours to figure out F.U. was Felix Ungar.
Felix Ungar: I put order in this house. For the first time in months, you're saving money. You're sleeping on clean sheets. You're eating hot meals for a change and I did it.
Oscar Madison: Yes, that's right. And then at night after we've had your halibut steak and your tartar sauce, I have to spend the rest of the evening watching you Saran Wrap the leftovers.
Oscar Madison: Don't come to me with your petty problems. You get this one stinkin' night a week. I'm cooped up here with Mary Poppins 24 hours a day.
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