Visible crew/equipment: After they finally get an address for the attempted suicide Squad 51 takes off, and when Engine 51 pulls away from the curb, the shadow of cinematographic equipment is visible on the engine's front, and the reflection of lighting equipment is visible on the side of the engine.
Factual error: When Roy is electrocuted and falls from the roof, after Karen uses the defibrillator paddles on Roy, she lifts both paddles, looks at the EKG monitor and says "He's converted." How exactly could Karen have known that he's converted? It's impossible for the EKG monitor to show anything at all. Either the defib paddles have to be in contact with Roy's body for the "quick-look" to get a reading, which they weren't, or the ECG electrode discs have to be on Roy's chest connecting him to the EKG monitor, and they weren't. As an aside, just watching Marco having problems attaching the air mask, and quickly glancing up towards the camera frustrated, then giving up is priceless.
Captain Stanley: How are you and Brice getting along? Roy: Fine. Fine. We're getting along just fine. Captain Stanley: Thought for a while there might be a little personality problem. Roy: No, I can work with just about anybody. I can get along with just about anybody. Captain Stanley: Glad to hear that. Roy: Just might have to bust him in the mouth to do it.
Trivia: Keep your eyes peeled for the big sheepdog who runs right into the patio door in the background, when Roy and Johnny are with the sitter who's hyperventilating, due to three very obnoxious boys she's been babysitting, and then the look on Johnny's face as he tries not to break character when he turns to Roy and says "Dumb dog." Also, a few moments later you'll see Roy and his imaginary watch. Absolutely priceless.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
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