Other mistake: Hawks is handed a pretty small container with some of the victims brains in it, and says there is about 50% of the brain still left out there to find. There is no way half of a brain is in that small container, it's not even filled all the way.
Other mistake: In the guest star credits, Shelly Cole's given name is misspelled "Sherry."
Other mistake: When Mac is reviewing the fact that the suspect has been researching his background, it displays a US Military separation notice on screen. The word 'separation' is misspelled as seperation, in caps.
Chosen answer: Probably to broaden the scope of the show's plot and give the audience a chance to see the characters in a different setting, People act differently at home from the way they do at their workplace. By the ninth season, the characters would have become overly familiar and predictable. It gives the writers a chance to do something different with them.
raywest ★