Visible crew/equipment: When Roy and Johnny respond to The Boat wreck with injuries off Catalina, they pull up to the Coast Guard Air Station, and when Roy joins Johnny on the other side of Squad 51, the moving reflections of two crew members are visible on the back of the squad.
Visible crew/equipment: At the structure fire, after the security guard is safely down the ladder, Johnny follows him as Roy watches from the window, and when the fire flashes through the doors, we can see the hand of a crew member pushing the lower boxes causing them to tumble.
Visible crew/equipment: When Mr. Laurents visits Station 51, as the guys stand up the actor's T-mark is visible on the floor, between DeSoto and Chet, just before Chet promptly stands at his mark.
Visible crew/equipment: When Squad 51 is dispatched to 'person caught in a mailbox', have a look at the squad's license plates when it rolls up on scene. The plates read "70324H" which is the California commercial plate number for Squad 51, not the usual prop dept's license plate "E999007." It was the prop dept's responsibility to change from the commercial plate to the prop plate, but this scene slipped by them. It's also interesting to notice that this scene takes place at a real intersection up the block from Universal Studios, which is the direction Squad 51 came from. Note the "Black Tower/MCA Tower" in the background, which houses Universal's executive offices.
What's a Nice Girl Like You Doing...? - S7-E7
Visible crew/equipment: After the last rescue it cuts to Roy as he says, "We'll catch you all a little later," and when Roy walks away we can see the actor's T-mark on the floor, where he was just standing.
Visible crew/equipment: During the rescue at the construction accident, when the man with the back injury is hanging from his line and is lowered after Roy untangles the block, we can see that in addition to the rope wrapped around the man there's wire and support that go under the man's jumpsuit. The wire/support are gone once he's lying on the balcony and they remove the rope.
Visible crew/equipment: When Johnny jumps from the third floor ledge onto the lifenet, in the shot of his actual jump we can see a cameraman wearing jeans at the bottom left corner of the screen, who's holding a handheld camera shooting footage while lying on the street. The angle of that footage can be seen just as Captain Stanley shouts, "Gage, you first," and also when they walk the lifenet over to their left, before Cap shouts, "Okay, Roy!"
Visible crew/equipment: When Engine 51 rolls up on scene at the paint factory structure fire, Captain Stanley heads towards the street corner, and we can see the actor's white T-mark on the ground before he gets on the HT.
Heavyweight - S3-E5
Visible crew/equipment: When the guy is stuck in the tree after his hang gliding accident, John ties the rope around the branch and begins to saw the branch while Roy uses that rope to slowly lower the branch. The problem is that just as the branch nears the ground, we can see the production crew's thin double lines securing the branch at the top right of the screen, and then those lines vanish when Roy joins John.
Paper Work - S6-E11
Visible crew/equipment: After rescuing the foreman and secretary from the structure fire with nitromethane drums, when Roy and John load them onto the ambulance, as Roy shuts the doors the reflections of multiple array lighting rigs are visible on its window and surface.
It's How You Play the Game - S4-E19
Visible crew/equipment: After the man with the herniated lumbar disc is removed from the waterbed and loaded onto the ambulance, when John gets into the squad, the reflection of a crew member is visible in the passenger side wing mirror.
Visible crew/equipment: When Roy drives off in the squad just as Animal Control shows up at the store with the tiger, we can see multiple reflections of array lighting on the vehicle and also the store's windows across the street.
Visible crew/equipment: While en route to the accident, just as we hear the dispatcher inform Engine 51 that the fire is out, in the exterior shot of Squad 51 there's black tape covering much of the lightbar's chrome atop the cab, which vanishes when they roll up on the accident scene.
Smoke Eater - S4-E16
Visible crew/equipment: When Station 51 is dispatched to the 'structure fire', in the shot facing the squad as it starts to roll out, we can see the black tape covering the lightbar's chrome surface atop the squad, which also vanishes at the incident.
Visible crew/equipment: During Squad 51's rescue of the hunter who was injured on the cliff, in the closeups of Copter 10's pilot, at the right upper corner of the screen above the windshield, we can see the edge of the white screen used to block the view through the windshield.
Visible crew/equipment: When Johnny tells dispatch to respond Engine 51 to Oceanland Park, as Engine 51 pulls away from the curb, the shadow of production equipment is visible on the engine's surface and the street.
Visible crew/equipment: When Station 51 is dispatched to the possible heart attack, just as Squad 51 is leaving the apparatus bay and passing the exterior glass doors to Captain Stanley's office, the reflection of the location's array lighting is visible on the glass doors.
The Tycoons - S5-E23
Visible crew/equipment: After inspecting Davey's Dogs, when John and Roy head to the squad discussing how only a total idiot would buy the stand, the reflection of the location's array lighting is visible on the squad's surface, and the reflection of the camera dolly can be seen on the chrome spotlight.
The Tycoons - S5-E23
Visible crew/equipment: When Roy and Johnny get back to the station talking about the ten fire inspections and two runs, the moving shadow of the boom mic is visible on the cabinets above Chet.
The Tycoons - S5-E23
Visible crew/equipment: During the fire at the chemical plant, a couple of shots after we see Captain Stanley walking between Roy and Chet as they're manning two hoses on the roof, we see a shot of Engine 15 as it heads toward the camera and then drives past it, and the reflection of array lighting is visible on the engine's surface.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy