I don't know if I ever saw the first episode and the last one too. I know I saw many of the in-between ones

First: "The Honeymoon" - Mike and Carol's wedding is a true family affair, complete with six children, two pets and a maid. And after the wedding ends in chaos, their honeymoon becomes a family affair too.

Last: "The Hair-Brained Scheme" - Bobby needs money, so he starts selling hair tonic. Greg decides to buy a bottle right before graduation to help his little brother, but it turns his hair orange.