If you're talking about the "User Comments", this is generic across all sets in a release, like the Forum link.
Yes, the comment is referring to the Base set being released in three series, but it can be accessed from any page within the 1995 Stadium Club set.
With regards to the Clear Cut Member's Only, the MO cards have a stamp on the lower left front corner. Look at the regular Gwynn and the Member's Only Gwynn. The stamp is just above his left ankle.
I'll never quit collecting entirely, but I am downsizing. Check out my COMC store and help me thin out what I don't want so I can buy cards that I do want. See something you like? Send me a message on here, and we can knock the price down quite a bit. I'll even take a bit of a loss if it means getting you a card you really want.