When Lucy Chen surprises Jeff Bundy. Jeff carries his rifle on a sling. Jeff proceeds to grab and raise his rifle towards Lucy, and Lucy shoots Jeff. While Jeff is down, Lucy pulls Jeff's rifle away with no issue, the rifle is no longer on sling attached to Jeff.
The symbol carved into the body is a pentacle not a pentagram. A pentacle is a 5 pointed star in a circle, a pentagram is commonly a 5 pointed star inverted not on a circle.
Lucy is in the hospital room and hears the news about the shooter. While a vital signs monitor is showing activity, not a single lead is hooked up to her, meaning the monitor is running in Simulation mode which creates a simulated set of vital signs.
The LAPD designates lone-officer patrol units as "L" units (Lincoln) and standard 2-officer patrol units as "A" units (Adam). Officer Chen is on patrol alone yet identifies herself as "Adam-19" when it should be "Lincoln-19" or whatever number is assigned.