There are a couple of very minor spoilers below so if you haven't seen the film just ignore everything from here on down.
+ The use of Linux (very Open Source) as a way of accessing the Grid was mostly accurate and you get points for using real computer OS. He tried
- su -r root to try and gain access to the most powerful account on the system.
- /bin/history - to draw up a list of what the previous user had done
- lasercannon -x - not a standard package on most Linux distributions but a powerful command
- Storage Disks - what diameter was everyone's storage disk maybe 20 inches. In the 1970s there were 8 inch disks, making way for floppy 5 1/4 inch disks in the 1980s and then standardising on 3.5 inch disks by the late 1980s. By now we have gigabytes on USB drives so why the need for frisbee sized storage devices that are always falling off and killing people?
I have some other thoughts on Tron Legacy that may form another cartoon but if you haven't see it you should go to the cinema and watch it so you understand this post.