When the baby eats the chilli, she knocks the tin from her pram and it gives a clanking noise as if it had struck a hard surface. But it actually lands on the carpet, and an empty tin dropped from only about a foot ought not to have made any sound.
While Jack and the neighbourhood ladies are playing poker, Caroline's return home from work prompts the women to stand up and hurriedly leave. In one brief shot you can see a group of "other" children in the living room alongside the three Butler children — presumably the offspring of the poker ladies. Yet not a single mum departs with a child; they may have returned later to collect them, but it would have made far more sense to have done so straight away.
The baby is eating chilli while seated in a baby walker. There's no way she could reach down to pick up the chilli tin from the kitchen floor.
On the aeroplane, the ice bucket for the wine appears with ice in some shots and without it in others.
When Caroline walks in on Jack and his girlfriends playing poker, she exclaims "Oh, pizza!" twice. Two separate takes from different camera angles were filmed, and both were inadvertently used.
When Jack kicks the television after his son Kenny phones Caroline, the screen is not damaged. The following day the television repairwoman finds that a shoe has smashed it.
While Ron is tuning through the radio stations in Caroline's hotel room, you can hear the same DJ banter that was on the children's radio at the start of the film.
During the race at Ron Richardson's house party, the competitors dash through a tape line at the end of the first stage and once more as they cross the finish line.
The shot of Zug Island, beyond the Ambassador Bridge, depicts winter — ice can be seen on the Detroit River — whereas the preceding scene (after Jack had been collected for work) is clearly set in summer.
As Jack chases the hoover from room to room, his shirt alternates between being dry and tucked in one shot and wet and untucked in the next.
The baby topples the two plants, yet they are later seen back in their original positions, undamaged.
Although the building Carolyn works in looks square, in the next shot she is in a glass lift inside a circular structure — presumably meant to represent the Renaissance Centre but filmed at the Bonaventure Hotel.
When Caroline returns and finds Jack bathing the boys, he initially has no paint on his face. Yet as Caroline starts to lift the children out of the bath he suddenly sports green paint splatters on his face. The paint marks on the bath wall also alter between camera cuts.
In the kitchen Jack's shirt is untucked on the left-hand side, but in the cellar it is untucked on the right-hand side.
While Jack is watching a soap opera, drying socks in the microwave, heating a cheese toastie with an iron & stapling the woobie, the number of socks draped over the microwave door changes.
The story is set in Detroit, Michigan. In a supermarket scene a display for C&C cola and soft drinks is clearly visible. C&C products are distributed only in the north-eastern United States, whereas Detroit, Michigan lies in the north-central part of the country.
Although the film is set in Detroit, mountains are visible from Ron Richardson's back garden.
When Jack goes to the temporary employment agency, the building is shown with stock footage of a Los Angeles property frequently used in television programmes.
At the supermarket, while they're sat in the car the child pushes the gear lever well past the reverse position into a forward gear, yet the car nevertheless reverses into the shopping trolleys behind them.
When Jack is in the delicatessen and asks for a pound of cheese, one of the options she offers is cottage cheese. Cottage cheese would normally be found in the dairy section rather than at the delicatessen counter.
Caroline waves to a bearded Jack in the upstairs window and gets into her car. As the engine is already running when she climbs in, she engages a gear and drives off.
When Jack first meets Ron, the chainsaw emits the loud, familiar roar of a machine seemingly running at full power (switched on, trigger depressed). Yet the blade itself alternates between standing completely still and turning only very slowly — implying the saw is merely idling or not actually switched on.
As noted earlier, when Jack turns off the water and pushes on the wall it shifts, but moments later, when he shoves the washing machine — which he'd overloaded and is now full of water and sodden clothes — it bounces as though perched on a single large spring.
There would be no reason for the parents' traffic pattern at the school to be reversed when dropping off or collecting their children. Entering from the right would always be preferable, as it allows passengers to alight or board directly at the kerb.
In the final scene of the film we see the tuna advert, which was filmed the day before, playing on the television. It would have been impossible for an advert to be filmed, edited, finalised and delivered to a given broadcaster for transmission in under 24 hours.
While Jack is in the cellar trying to stop the washing machine's hoses spraying water, Kenny is shouting for help upstairs. As soon as he turns the water off, Jack spins and dashes upstairs, bracing himself against a concrete wall. When he pushes on it, the top section shifts, revealing it is merely a prop fixed only to the floor. The moment he releases it, it springs back into place.
Towards the end of the film, as Caroline returns home and spots Joan's car outside her house, it is actually parked in Jack & Caroline's neighbour's driveway rather than theirs.
After Jack turns off the water to the washing machine, he darts up from the cellar to rescue a child from the vacuum cleaner upstairs. As he runs, he pushes against a breeze‑block wall to squeeze past the washing machine and the wall shifts. A breeze‑block wall in a cellar would not normally shift.
As Caroline begins to doze off in the shower and Jack rouses her, she leaps up wearing a tan bathing costume.
When Ron moves up to Caroline to deliver the line "There are no kids to go home to tonight," he ends up standing too near the boom microphone, causing his voice to pick up an echo.
The chilli tin that Megan is "eating" from was empty when Jack knocked it onto the floor.
