Goofs

When the two men are swimming at night, they are sometimes shown to be naked, and other times (underwater shots) shown to be wearing boxers or swimming trunks.

After Irene and Vincent have sex, you can see that the bedroom walls are pure glass (including the corner of the house). You can also see a view of the beach and ocean. Later when Vincent is on the beach scrubbing himself with sand, the house is viewed from the beach. At that point you can see pillars in between pieces of glass on the house, including the corner.

Jerome rips his jacket sleeve seam while punching out the police officer, yet soon after it is intact.

When Vincent is being evaluated as an acceptable candidate to become Jerome he is asked if he has any distinguishing marks or tattoos and he says no. Near the end of the movie when lying in bed with Irene his shirt is off and you can clearly see a birthmark on his lower chest.

When Jerome and Eugene are out at the club, on the table there is smoke coming out of Jerome's wine glass before he blows the smoke into it.

The real Jerome uses the wrong wheelchair for a paraplegic person. The wheelchair shown in the film is used for short transfers (e.g. from one hospital room to another). A wheelchair to spend the entire day in is more ergonomic and has much better padding. Surely somebody like Jerome could afford one of these.

Using hair/eyelashes for genetic testing will fail if no follicle is attached, but this method is used when no other material is available or the information is being obtained surreptitiously (as Irene and the investigators are doing when they use this method). Urine is not the most efficient way to perform genetic testing when other samples are readily available, but the urine test was also performed to look for drug use as evidenced by Eugene's sample failing when he was drunk. More specifically, urine itself does not contain DNA, but it may contain epithelial cells, which do contain DNA.

When Vincent alias Jerome has his interview at Gattaca you can see that the machine clearly shows a registered GNQ of 9.8612 on Jerome's profile. When Irene gives the hair sample away for analysis, the woman at the counter states "9.3, quite a catch".

However, the lowered score is not a goof. It simply means that Jerome's current GQ score from his hair differs from his registered score at birth, and that it had deteriorated because of DNA mutations due to his unhealthy lifestyle (smoking, alcohol abuse, limited exposure to sunlight, no physical exercise) in the past years.

In the beginning when Vincent is putting the blood into the fake thumb he puts it on his left thumb but he always uses his right hand to get tested. This is because Vincent himself is left-handed, but Jerome is right-handed so he had to make the switch when he assumed Jerome's life.

Supposedly the mission to Saturn's moon Titan is possible only once every 70 years. Maybe inspired by the Grand Tour program, possible only every 175 years. But that was to visit all four giant planets. Just going to Saturn, there are many more possibilities.

When Vincent is born, it is reported there is a 99% probability of a heart condition. While at dinner with the family, this is repeated. However, later when the detectives are discussing the profile found they state there is a 90% chance the person has a heart condition. The probability of getting a disease may change when you get older, and the reading at his birth was only an estimated figure not an accurate one.

Vincent said "no" when German asked him if he had any visible marks. When shirtless, a birthmark can be seen on his right side.

When Jerome starts to crawl up the spiral stair, he moves his legs with his hands as he is supposed to be paralyzed. However, a moment later his legs can be seen slightly moving when he is struggling to get upstairs.

As Vincent gets ready for his first day at work as Jerome, he pulls out his shirt from the closet and you can see fingers of someone holding the closet door open.

The dolly track can be seen on the left of the screen when Vincent is standing in line to have a blood test done.

When the detective shows the picture of Vincent to the director, the power cable to his "hand-held display" (prop) is clearly visible running around his hand and up his sleeve.

When Vincent is confessing to Irene, he tells her he doesn't have 20 or 30 years, his heart is already 10,000 beats overdue. In an average male this would only be about 2 1/2 hours, not several years as the story suggests.

Even before he assumes Jerome's identity and trains himself to be right-handed, Vincent can be seen doing things, for example using a scrubber to clean up, the right-handed way instead of how a natural left-handed person would do them.