NY POST...MICHAEL STARR....
--Nickelodeon has a treat for "Seinfeld" junkies who've been mourning the NBC sitcom since it left the air in May '98. OK, so it's not Jerry Seinfeld - but it's close. Barney Martin and Liz Sheridan, who played Jerry's parents on "Seinfeld," will reprise their roles in an episode of "Noah Knows Best," a new Nick series premiering Oct. 7 at 8:30 p.m. In the episode, being shot next week in Orlando, Fla., Martin and Sheridan will play "Jerry's parents" and Noah's neighbors who are house sitting in Jerry's New York apartment while he's out of town. The couple can't be identified as "the Seinfelds," for copyright reasons, but there will be plenty of inside jokes referring to "Seinfeld." "Noah," described as a boy's version of "Clarissa Explains It All," stars Phillip Van Dyke, the original voice of Arnold in Nick's "Hey Arnold."