Another dated item on that Seattle bus film: at one point the bus makes a right turn on a busy main road, and there's one single 4-way traffic signal suspended by span-wire over the center of the intersection. The US Manual on Uniform Traffic Control Devices now mandates a minimum of two signal heads in each direction, in case of burned-out bulbs.
How about that Ernie (and Bert, sort of) routine in which a medical doctor makes a house call? For those too young to remember, doctors used to visit you in your home when you got sick, carrying everything they needed in that little black bag. This phenomenon can be seen in the Brady Bunch episode in which all six kids got the measles (before immunizations -- something else dated right there) and both a man and woman doctor came to visit. It was either the late 60s or early 70s that doctors stopped making house calls. Some doctors may still do so today, but it's even pricier than an office visit, and is reserved for the direst cases and/or immobile patients only.
A Jerry Nelson-voiced doctor arrived at Ernie's door. He had the usual stethescope and that reflector thingy on his head, and I think he was based on the Fat Blue Muppet. In any case, Ernie thanked him for coming, and the doc promptly told Ernie to open his mouth. Ernie tried to explain something with his mouth constantly kept open, "ah...rhaa..rha..". The doc eventually told him to close his mouth, then did all the usual tests while Ernie tried to explain something. Finally the doc gave his diagnosis: "Ernie, you're fine; why did you call me?" Ernie, up until now unable to get a word in edgewise, explained "Because my friend Bert, has a TUMMY-ACHE!... He's right this way." The doc and Ernie walk off camera to the right. The last words we hear are the doctor saying "OK Bert, open your mouth." Note that Bert was not seen in this sketch, nor did he have any lines.