The yellow house sitting on top of the abandoned oil well is the same yellow house featured as Geneviève Bujold character's home in the film Earthquake (1974). This episode was filmed shortly after "Earthquake" was completed, so the rigging necessary for the house to partially collapse was already in place.
A similar house disaster will take place in #5.11; " Tee Vee," at the end, on the final call.