I just discovered these two early commercials with John Belushi on YouTube:

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The YouTube blurb reads: John Belushi got his start at Chicago’s Second City Comedy Club. These commercials created by Jim Weller were the only footage he had to send as a Demo Reel to Saturday Night Live.

John Belushi's 1st Appearance on TV

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Claudia Lamb [Heather from the 70s Norman Lear soap Mary Hartman, Mary Hartman] is featured in this commercial.

As she writes, "I couldn't look at a $100,000 bar for a few years."