When the Jaws of Life were used to cut the steering column of the dynamite truck the steering wheel pops Angelo De Meo in the side of the head when the pressure was released
When Johnny is taking pictures of the various crew, around the firehouse in various locations, he suggests to Chet that he move to the map area for Johnny to get a picture of him there, to which Chet finally responds, "What ever you say, C. B." This is a comical, mocking reference to Cecil B. Demille, the famed Director.
In the call to deal with the sick airline stewardess a non typical fade-out sequence is used as they show the victim being transported by ambulance without showing the team contacting Rampart & reporting the patients status, vitals, etc. as is usually seen.