This is the Retrospective Interview that was included as a bonus feature on both the end of the VHS release and on a menu of the DVD release of It's the Pied Piper, Charlie Brown.
Note the varying quality of sources, with some footage being from Paramount's digital remasters and others seemingly older than that.
Also note that this showcases titles which didn't get releases on DVD until a few years later, most notably Be My Valentine, Charlie Brown and It's the Easter Beagle, Charlie Brown.
Sorry for any frame drops that may have came out of this video, I guess OBS didn't feel like recording right.