I just finished watching "Meet the Meteor" (again) and never get used to the different opening. Amazing how you get accustomed to seeing something. And the end theme had something I never noticed before. They say:
"So join us here each week my friends, you’re sure to get a smile
For seven stranded castaways, here on Gilligan’s Isle!"
This is from the first season.
I think someone has picked up the fact they use the first season closing theme before but I've never caught the difference in the lyrics until now.

That is strange. Here is a little comparison from episode 67 and episode 68.

you guys are right those are weird

LOL, they did a little switcharoo. I knew I wasn't crazy when I thought that had changed in the middle of the show. ;)