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At the begining, during the credits, Patrick McKenna's son is credited incorrectly. He's called Brenda McKenna, when his name is actually Brendon (actually I've seen several ways of spelling his name, including Brendan and Brenden, so I'm unsure how his first name is spelt, but it certainly is not Brenda).
In this ep. as well as 1-5, it's shown that Marty has a third child, a daughter. In this ep. we learn her name's Bridget. Here on out she's dropped from the show. Further proof is in the first episode of season 5 where Marty states ALL of his children's names and ages, only mentioning Randy and Mark.