Dean Richards confirmed that is his "WNUA" voice in this clip on air in a story about the start of digital lotto drawings.
https://www.youtube.com/watch?v=RnP86LZPgog

PVX: I was a master control operator in the 1990s and 2000s, and the ISCI codes were 4 letters and 4 numbers. An Ad Council public service announcement started with the letter C and three letters for the campaign, the digits would start with the year the spot was created, the revision or version number, and the last 2 digits being the length of the ad, so a 30 second Smokey the Bear Forest Fire Prevention PSA from 1999 would have been CNFF-9130.

10/10

Same lady that went on to play on the show Family Ties!

Is that cottage cheese on the plate, or some kind of tartar sauce?

https://www.youtube.com/watch?v=M5-x-9LciYA is basically the same ad about 13 years earlier sans the baby.

Mark-Paul Gosselaar's first commercial is for DAS Smurf Modelling Clay. He would have been 8 years old here.

The reaction of how Moe and Curly turned around to look at the wall paper is still funny as heck to me!! LOL!!!!

Additional note: CHCH in Hamilton began rerunning the series as of January 21, 2019, with special guest appearances by the Diff'rent Strokes main cast in that first episode (originally aired August 24, 1979 on NBC), and a larger cast than what we'd be accustomed to in later seasons as the girls grew up over the years.