How to Recognise Different Types of Trees From Quite a Long Way Away - S1-E3
Corrected entry: After Bicycle Repair Man gets on the bus, it drives off. In the next shot, it drives round a corner past some houses and parked cars. To the left of the bus, a little boy can be seen on the street (just walking past a car), and behind the bus, a man can be seen walking in the background. Neither of these people are wearing Superman outfits, like all the other characters in the episode are.
Correction: Later in the sketch it is revealed that "stockbrokers, accountants and church wardens" are all regular sights in J W Superman's world. Obviously there are some non-Superman people about, and you saw two of them. Not a mistake.