Assuming that the mower was properly maintained and didn't have important safety features disabled (which would become a liability issue for commercial use), the mower would not have started while the blades were engaged.
Radio amateurs use legally assigned, and legally required, call signs, issued by the regulating authority on passing an amateur radio exam. They do not use "handles", which are self-assigned by CB users. The uses and on-air procedures are distinctly different between radio amateurs and CB users. For instance, a radio amateur MUST give his call sign, at least at the beginning and end of a conversation, and usually at a specified maximum interval, like 15 minutes (in practice usually a lot more often). A radio amateur's call sign will be mapped to his/her real name and address by the regulating authority, and McGee would have access to this information. Non-licensed persons are not legally allowed to use amateur radio frequencies (except in an emergency), and a radio amateur would not normally converse with an illegal user.
When Bishop is looking through the garbage at the vet's office, the vet tells her to be careful because there are sharps in it. No doctor would ever put sharps in a garbage can. They are required to go in a specific sharps container.
Reeves chess board (on the computer) is incorrect: lower right square should be the light-colored square.
In this episode, Torres accidentally donates 5000$ to a charity. He had been saving the money for a bike, so he is upset. Yet, in season sixteen, it's revealed that Torres has quite a lot of money saved, the result of not having to spend any of his salary during his years undercover.