Continuity mistake: When John and Roy are at the park with the injured football player and his son, the shadows that are cast over the entire area change significantly when the ambulance arrives.
Continuity mistake: When Johnny and Roy are on the "child locked in a bathroom" run, Johnny makes a hasty retreat leaving Roy to deal with the "child." The bar of soap Roy uses is on a curved pedestal soap dish, and that dish is either curved towards the wall, or turned the opposite way, depending on the camera angle.
Continuity mistake: When Brackett tells Morton that he can go keep Early company while he awaits test results, Brackett's wearing a patterned tie, and when Brackett walks into treatment 3 his tie is tied differently.
Continuity mistake: When Johnny and Roy are in the basket with the man who was electrocuted by a power line, they are atop three more power lines. Chet and Mike cut the two outer lines and only the center line remains, but in the closeup of the basket there are still three power lines under the basket.
Continuity mistake: After Dr. Early fixes the squad's engine problem, while Roy is driving we see a two-way radio mounted at the top of the dashboard, just past the steering wheel. When the dispatcher calls on Squad 51 to respond, there's a closeup of the Motorola two-way radio/Interceptor units which are mounted under the dash (near gas pedal), and Johnny lifts this mic, but then we see that he's speaking on the mic from the top of the dash. Additionally, in those two closeups of the two-way radio, we can see the gas pedal, but Roy's foot is nowhere to be seen, even though the squad has been moving all along.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy