Most shows from that time period had sponsor logos somewhere on the closing credits. When shows were prepped for syndication, a new credit package was done removing the sponsors. Since the first 5 seasons of My Three Sons were never put into syndication, this was never done. So when the show was...
I really only liked the first 5 (ABC) seasons of this show with Frawley and the original sons. I have them all from Nick at Nite, which ran them through complete the first time but it's still nice to see them get a release.