McGee talks about a new kind of mouse, a 'laser mouse'. All optical mice are 'laser' mice. Optical mice work by using a laser (LED) to illuminate an area many times a second and an optical sensor to detect the movement of dust, dirt and any imperfections between scans. A laser is used because monochromal light makes it easier to detect changes.
Phineas is 9, and yet is playing games online fluently, despite his mothers objection. Childrens Online Privacy Protection Act (1998) effectively bans all online users under the age of 13, and allows 13-17yos to participate only with parental permission. Without parental permission, Phineas' account would not be lawful, and any evidence obtained using it would be inadmissible, as would anything developed from it.
When Gibbs is responding to Phineas's message at the end of the episode, he uses to many keystrokes for a smiley face emoticon.