The corporate jet has three engines on take off, but lands with only two.
At the beginning of the scene of the meeting between Allsafe, ECorp, and the FBI, Rami is seen sitting at the table with the blue folder in front of him. Shortly after, Rami pulls out the white folder and places it in front of him on an empty table where the blue folder was seen just moments before that.
When the character Ollie is first introduced, the strap on his backpack changes position every jump.
The "FBI" agents towards the end of the episode are, for some unknown reason, wearing FBI navy blue windbreakers in a board room meeting and are all displaying badge on chains around their necks. The Badges are not FBI badges, they are all the wrong shape.
Elliot runs dictionary attacks but those are quickly and easily blocked and would not exist in the real world. A better dictionary attack would be about 10-60 seconds between attempts, not milliseconds.
Unless the company assigned Colby a dedicated public IP address or he had a dedicated private connection, he would be using an IP address or connection shared with other people within the company, leaving no way to publicly know which user was using it at any moment in time.
When Elliot is first talking to Krista Gordon (his psychiatrist) there is a flashback shown with a terminal session on a computer and the first command being "ping" followed by an IP address. The terminal looks similar to what you would see in Linux, however the ping statistics show up as input commands instead of an output.
The IP address Elliot is given for Colby's terminal is '218.108.149.373' which is an impossible IP address since the highest a number can be in an IPv4 address is 255.
Allsafe's firewall appears to be named "allsave" instead of "allsafe". Possible but unlikely.
Angela Moss doesn't know what a rootkit is even though she is working in a cyber security firm. This is actually a plausible situation given the pressure on the IT industry to become more diverse, especially in regards to women in STEM positions. Angela was most likely hired to fulfill this edict making her lack of cybersecurity skills irrelevant.
after the Flight back to NYC, Elliot follows "Mr. Robot off the subway, at the Church Avenue station, Mr. Robot says "we have to go to Brooklyn", except Church Avenue station is in Brooklyn already.
When Wellick comments on the desktop environment Elliot is running he mispronounces GNOME with a silent "G" like in "garden gnome". GNOME was originally an acronym that stood for 'GNU Network Object Model Environment'. Despite dropping the the acronym while keeping the name it is still pronounced with a hard "G" like Guh-Nome or G'nome.
As evidence of Terry Colby's supposed tech cluelessness, Elliot points to the fact that Colby owns a BlackBerry phone. However, Blackberries are known for being easier to secure than other smartphones, making it a reasonable choice for a security conscious executive like Colby.
Elliot tells his psychologist, Dr. Gordon, that the medicine she has given him is working. However, psychologists don't prescribe medical drugs in real life. They can only be prescribed by a physician specialized in psychiatry.