When the team boards the two helicopters (at around 58 mins), the helicopters make a very distinct, high pitched sound. This is a very unique sound that is made by helicopters with a a Fenestron (Fan-In-Fin) tail rotor. The Augusta Westland AW189s used in this movie have conventional tail rotors, and have a very different sound in reality. In fact, the sound used for the movie most closely matches that of a Airbus Helicopters (Formerly Aerospatiale/Eurocopter) Dauphin family - perhaps the most recognizable of Fenestron equipped helicopters.
About halfway through, they suit-up to enter the reactor. They put on their HazMat gear but they don't put on the proper boots or tape up their pant legs (to their boots). They also don't tape up the zippers of the suits. These things are always done in HazMat situations.
While hacking the Blackhat servers, Hathaway forces a boot in single mode and makes a backup of the whole userspaces to a NTFS partitioned drive.
The system is running an old kernel from 2006 (release date of 2.6.18 kernel) and luckily it already supports NTFS partitions. It would be wise to use a partition that has full support on unix filesystems.
If the kernel was older, he would need to figure out another way to transfer the data.
When Lien and Nick are outside walking to the hacker's apartment in LA, she can be seen wearing maroon colored tank top. In the next scene inside the apartment, the color of her tank top suddenly changes to light blue instead.
When Hathaway is using keylogger software to capture Donahue's password to the NSA's Black Widow program, they show a view from under Donahue's keyboard, with him supposedly typing his old and new passwords. It clearly shows the space key being pressed a couple of times, even though the next screenshot shows no spaces in the passwords.
In the final scene where Nick Hathaway & Chen Lien are leaving Indonesia, it appears that the airport is in fact in Malaysia by the signs outside "Kota Baharu" (Malay spelling and inside "Ketibaan/Arrivals" (should say Kedatangan).
During the nighttime shootout in Hong Kong, a POV shot shows Agent Barrett looking up at Building 2 of the International Finance Centre. This building is several miles from the location of the firefight (outside the Quarry Bay MTR station) and would not be visible from this angle.
When looking through the hex dump, Nick Hathaway comes across a "//TODO ... " and infers the malware developer was in a hurry. Compiled binaries don't contain programmer comments. They are removed very early in the compilation process.
Hathaway is shown using a smartphone app named "Wipry" to search for the hidden bluetooth transmitter signal in Hong Kong using an Android phone. In reality "Wipry" is only available for Apple products and not for Android.
Characters are shown walking around the grounds of the nuclear power power plant in street clothes within days of its containment building suffering a massive rupture to its shell. This area would be highly radioactive and uninhabitable for months if not years.
The vehicle that pulls up to the Chai Wan plant immediately after the explosion is a mainland Gong'anju (Public Security Bureau) car, which would not be present in Hong Kong. In Hong Kong the equivalent functions are handled by the Hong Kong Police Force, which drives distinctive cars marked with "POLICE" and its Chinese equivalent (gingcaat).
Around 27 minutes, the "team" is at the tech company located in Chicago, Illinois. When they review the security was breached. While there, they review in house surveillance video, 1 if which is located in the men's restroom. This is illegal, especially in the United States. They would be liable for breaking personal privacy laws, at the very least, regardless of who did what.
On his first appearance as a technical advisor, after Hathaway is presented as a dangerous hacker, he's invited into a data center (where he gets full access to a keyboard) just to check the content of a pen drive, which could be checked anywhere else.
The goof items below may give away important plot points.
Crew or equipment visible
Around 94 minutes, the guy on the motorcycle throws Nick Hathaway's (now removed) tracking anklet off the (huge) Hong Kong Bridge, with it falling onto a passing container ship. As he is coming to a stop on the motorcycle, you can see the side lane he is in has (conveniently) been closed with orange traffic cones; obviously for all the camera equipment and crew required to film this.
Around 54 minutes, the team goes to Shek O, and Hathaway finds Kassar's Bluetooth transmitter. When they show the text on the screen, it is encrypted in one font; however, there is a portion at the top of the screen which reads "GPG Encyption", but it is a completely different font than all the test. Obviously, someone "cut and pasted" into the text. This is clearly an error.