Somewhere between his gigs as Frankie the Joke writer on “Benson” and as Jerry the Joke Teller on “Seinfeld”, hot young commedian Jerry Seinfeld appeared on a mid 80s episode of TV’sBaPJ”…not that there’s anything wrong with that. To fill out the 10 minutes, a few British commercials from another segment of the show, one of which features Frankie Howerd, best known to American audiences as Mean Mr Mustard in the 1978 movie “Sqt Pepper’s Lonely Hearts Club Band”.