Other mistake: At the scrapyard with the man who was nearly crushed in the car, when Roy takes his BP the stethoscope chestpiece is on the man's arm in the wide shot, but in the closeup the chestpiece hangs in mid-air not actually touching the man's arm, yet Roy continues to read the BP.
Other mistake: Station 51 responds to an "accident with injuries, " address 7526 Sunset, cross street, Abbott, to rescue two people stuck on scaffolding at the top of the tall building. This distinctive, mirrored glass building was also used this season in episode 6, "Rules of Order", with the address given as 3120 South Century, cross street, Burgess, for the rescue of two people hanging off the side of the tall structure. The actual building address is 500 190th Street, Gardena, CA.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy