When the crew arrives at site of the oil well blowout, the house above is collapsing. As it does, one of the columns holding up the porch falls and the roof above it comes down. However, several minutes later when the firemen bring the victim out, the column and roof are back in place.
Dr. Early is the first of several people to fail at fixing a motorbike that won't start. But an earlier episode established that Dr. Early is actually very well versed in engine mechanics, when he quickly fixed Squad 51 for John and Roy.
Arriving at the industrial fire near the end of the episode Engine 51 lays in with dual lines. As the rig comes to a stop the hoses coming off the back of the rig are already muddy, as if this was a second take.
In the scene with the man trapped, Chet is on the wireless phone with Rampart while Roy is yelling to Chet the man's vitals. Dr Bracket asks "how long until you can extricate the victim". There's no way Roy could hear that, but he still yells out that "we don't know yet".