Isn't there a longer, minute version of this commercial? If I remember, they also had a segment where Larry from Perfect Strangers, "Boz Knows Comedy?" and you see Cooky trying to hit Bozo with a pie and as usual, it backfires. I swear I saw it on here. I checked YouTube and there's no such commercial on there.
Around Why-Tee (the phonetic spelling for the initials of YouTube), you have quite a few editorials (and even some editorial feedbacks) from sister station WPIX Channel 11 in New York City, as delivered by Richard N. Hughes who was perhaps the most famous of the editorialists in NYC. Pray tell, who amongst the Chicago TV stations' editorialists would have been better known "at the time"? I'm banking on WMAQ's Dillon Smith . . .
NYC sister station WPIX Channel 11's "Portions..." wording was "Portions Of The Preceding Program Were Pre-Recorded." The "pre-recorded" terminology was used by NYC stations almost uniformly, as if they believed New Yorkers wouldn't understand what "mechanically reproduced" meant.