The building at the bear trap rescue is the same building as the one seen in the opening credits of "Sanford And Son."
The doctors check the female victim for her "Babinski Reflex." The plantar reflex is a reflex elicited when the sole of the foot is stimulated with a blunt instrument. The reflex can take one of two forms. In normal adults the plantar reflex causes a downward response of the hallux (flexion). An upward response (extension) of the big toe is known as Koch sign, Babinski response or Babinski sign, named after Joseph Babinski (1857-1932), a French neurologist of Polish origin. The presence of the Babinski sign can identify disease of the spinal cord and brain in adults, and also exists as a primitive reflex in infants.
At Lake Castaic, Engine 81 is really the Engine 51 rig; it was just rebadged with a different number.
Patient Zelda Zeck first claims her age is 39, before admitting to 50 and finally confessing that her real age is 52. Actress Virginia Gregg was in fact 57 at the time.