Darryll Lucas (who played Barth's helper Zilch) was the only kid who did not play himself on the show. All the other kids played themselves. Darryll Lucas's father was head of marketing at CJOH-TV.
Eugene: You know whenever my dad has beer, he never let's me have a glass.
Christine: Well, I should hope not, Eugene. You're a little too young to drink.
Eugene: Goes to show you how much you know. He says I'm old enough to take it from the bottle.
The 1985 "Fears, Worries, and Anxieties" episode had to be modified in one scene. The scene had Alasdair, Mom, and Dad talking about a bully at school called "Killer Curtis". When it was discovered that there actually WAS a murderer named Killer Curtis in the U.S., they decided that the bully's name should be changed, so the words "killer Curtis" were changed to "Crusher Willis". This was done very badly because between the time that the episode was shot, and when they made the recording, Alasdair's voice had changed.