Continuity mistake: When Helen and Frank are out on their first date, Helen loses her slip in the bar and Frank retrieves it. After that, Helen's slip mysteriously disappears because she is obviously not wearing it (since the girls cut her dress, she would've had to have pinned it back up or else it would be visible). Also, Helen's purse is too small to stuff it into and Frank didn't bring anything to carry it in.
Factual error: In the scene where Frank is giving Helen a ride home from the Japanese Restaurant, when they drive across the Golden Gate Bridge, you see them pass three support towers when there are only two on the real bridge. There are also exit signs that disappear just before they pass the third tower.
Continuity mistake: When they all first move into the new house after the wedding, they are scrambling to get settled into their rooms when the lights go out. Helen and Frank hand out candles and Helen asks Greg to take some downstairs. After he heads downstairs, a voice is heard remarking, "Where's 6-blue-B?" According to Frank's chart, Greg is 6-blue-B. Also, the voice-over begins just before the shot switches off of Greg heading downstairs.
Continuity mistake: In the scene where Frank brings Helen home to meet his kids, he asks Mike to fix them a drink. He does, but only fills Frank's glass halfway. When Rusty takes the drinks to them, the glass is full.
Continuity mistake: When Helen and Frank go to the bar on their first date, Helen asks Frank to get her some cigarettes. Frank returns with six packs of cigarettes, three in each hand. Helen then claims that she doesn't smoke, and Frank puts all six packs into one hand to accept a drink. When we next see Frank's hand he has three packs of cigarettes. Finally, the cigarettes disappear completely.The cigarettes couldn't have fallen on the floor because we see the floor in different shots. And, as Helen and Frank are standing in the middle of the bar, surrounded by people, Frank has no place to put the cigarettes.
Continuity mistake: When Frank brings Helen to his house to meet his children there jam smudged on the front window and it changes in between shots.
Continuity mistake: When Frank's brother and sister-in-law leave the house with Germaine and Joan, they are shown (in a mirror) walking out the front door, which has a picture on the wall to the right of the door (left side of the mirror). The wall is flush with the door; however, in a later scene (one of the housekeepers walking out the door), the wall (with the same picture) is perpendicular to the door.