Near the end, Latham is outrunning the police helicopter while on foot.
When Hooker realizes that the drawing is his former partner, they go the computer for his record and the picture on the computer is the exact same drawing that was just made.
Hooker's unmarked car as 4 X-ray 30 had no windshield wiper blade on the driver side. The arm was there, but no blade was in place. This reveals the car was used for close-up shots and was not one used for regular driving scenes.
When Stacy reads information from the screen showing the drawing of Hooker's ex-partner, there is no text on it, just the drawing.
No explanation is given for what happened to Vince Romano.
As is often the case in the series, Hooker fails to follow best practices for police work and sub-par performance results. In this case, he spotted the suspect's orange car and instead of coordinating with either patrol or other unmarked cars he initiates a solo pursuit and the suspect escapes.
Stacy describes the charred piece of paper as a motel registration, then says apartment 22B. They go to an apartment building, not a motel.