Other mistake: When Johnny and Roy are with the baby who's sleeping in the back seat of the locked car John says, "The roof is hot, I think the heat might have built up inside," and the bystander says, "Lord knows how long he's been lying in there broiling in the sun," but what's funny is that they're all wearing winter coats and jackets.
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.
Charlie: I think you guys are playing games with me, and I don't like it.
Roy: Now, wait a minute. We're not playing games. We don't play games with the equipment...
Captain Stanley: Wait, hold on. C'mon everybody, look we're all on the same side here, aren't we?
Charlie: I wonder.
Captain Stanley: Charlie, why can't we put the squad in the shop and have us a reserve vehicle here?
Charlie: No, no, Hank. Not until I'm 100% sure that I can't fix it. If there's anything wrong with it. This coffee stinks. [Leaves the room.]
Captain Stanley: You guys playing some kind of joke on him?
John: We didn't make the coffee!
Captain Stanley: Not the coffee, you twit, the squad.
Roy: Cap, there's something wrong with that squad out there.
Captain Stanley: [sigh.] All right, if you say so... I made the coffee.
Trivia: During Richard's rescue from the ledge at Rampart, the snorkel that Roy and Brackett climb onto is Truck 127, from Station 127 aka Station 51. Truck 127 is used in many episodes requiring a snorkel, including 1x6, "Dealer's Wild" and 3x16, "Fools." There's a particularly nice shot at the end of this episode, when Engine 51 and Squad 51 are parked parallel to each other, and when Johnny responds to dispatch that Squad 51 is available, Truck 127 drives away between 51's vehicles. Nice touch.