Patrick drops someone's iPhone into a fish tank to disable it. The phone is an iPhone 4 (32-pin connected, no beveled edges) and was therefore water resistant. The quick dip in the tank would not have disabled it.
Cho and Rigsby are chasing down a City Bus in what is supposed to be downtown Sacramento. They pass by a street called Hope and finally stop the bus at a street called Flower. There are no such named streets in the downtown area of Sacramento. With a few exceptions all the streets are either numbered as in 17th Street or lettered as in P Street. And the street named signs are colored green not blue as seen during the chase. On the other hand there are both a Hope and Flower street in downtown Los Angeles.
After losing 3 prior Red John associates to murder and suicide, CBI would have taken every precaution on taking a fourth. It makes no sense that she would be transported alone, with only one police driver, unsearched, and able to take a suicide tablet.