In the first one, actor Victor Raider-Wexler+ is a headshrinker who advocates scream therapy with the Looney Tunes cartoon characters. In the second one, at its end A sarcastic Daffy Duck says "Yeah. Cute like a stomach pump", and this ad was also for the looney Tunes.

In a third one, they played Mozart's "A Little Night Music" with these sung lyrics:

"Loo-ney Tunes, here on Nick at Nite.
Con-flicts. You can solve with dynamite.

Passio. Come feel the passion."...etc.

The actor mentioned with the "+" played a doctor in the "Junior Mints" episode of Seinfeld.

hmm, I don't remember those

Me either, I don't remember those commercials on Nick at Nite. I only focused on cartoons when I was young.