When Principal Skinner is crossing the highway, the sign says "Principal Crossing Highway. Expect Delay". How could someone (who would write it there) know that the person he is refering to is a principal?
Also, how can a man crossing the road or a highway delay you?
The overhead pedestrian walkway the kids are standing on to watch Skinner from disappears whenever the view switches to show Skinner dodging traffic.
Scarlet Tanagers wouldn't migrate to a specific location like Machu Picchu, but South America's Western Seaboard