The Bissells' kitchen wall telephone moves from being mounted on the outside surface of the post to the kitchen side of the post.
When Min serves Sam macaroni and cheese, the serving spoon changes between shots.
When Jen is unpacking her moving van box, she is surprised by her greedy cousins, and drops a large ashtray on the coffee table. A split second later, the ashtray has disappeared and has been replaced by a huge wad of packing paper.
When Sam drives Howard into San Francisco to work he parks next to a 1950 Chevy pick-up truck. Once Howard exits the car the vehicle next to them is a 1958 Chevy station wagon.
The Bissels' Red 1964 Ford Wagon has one style of hubcap parked in their driveway, and when seen dropping off Sam in front of his office, a completely different type.
While the "Let Hertz Put You in the Driver's Seat" commercial was a TV staple in the early 1960s (created by the New York advertising firm NCK), its production in this film is fanciful. In actual movie making, the scene would be "shoot to playback (pre-recorded music)" if a musical track was used, and no singers would be on stage to do endless retakes as seen here. In fact, the jingle would not be played at all; the scene would be shot silent, with the jingle added later. Also, no advertising agency has a full sound stage in-house. No sound stage is an open corridor where people pass through, but is closed during shooting.
Near the end of the film, when Janet and Howard kiss, the sound of a motor-driven still camera can be heard (taking promotional photos for the film).
Although the story is supposedly taking place in San Francisco the exteriors outside Sam's office, as well as those on skid row at the end of the film, are in Los Angeles. The automobile chase around San Francisco makes no geographical sense, and when Sam and his rider finally arrive at what's supposed to be 29th and Geary, it's a studio set that looks nothing like the real thing.
In the movie photographers take candid pictures of people for ads, and even use them without the subjects' knowledge or approval. By law, the subjects would have to sign a model release before the pictures could be used for commercial purposes.
At the dinner party Mr Nurdlinger quotes Isaiah 6, supposedly. In fact it would be closer to Isaiah 5.
Characters keep calling the Bissells' birds as "ducks", when in fact they are geese, not ducks.
At the dinner at Edward G Robinson's home, he quotes the Bible and says the quote is from Isaiah, verse 6. He doesn't say what chapter.