You can find all three seasons and one of the films on DVD. The other three movies were never released on DVD, but if you really want them, you can find them on bootleg, although I don’t recommend it! :)
MeTV plays reruns as well as several other classic TV channels, but I don’t know about YouTube.
Hope that helps!
Gilligan [Season 3, Episode 1 - Up at Bat]
In the episode, “Feed the Kitty,” we find out that Lovey is allergic to cats. Several episodes later, in “The Friendly Physician,” there is a cat in Boris’ castle. However, despite the fact that Lovey is around the cat quite a bit, we never see (or hear rather) her sneeze.