Last year, in Allergy Time (1966), the Professor used big, bulky syringes and needles he'd crafted from plants to administer allergy shots. But here he has a shiny new glass syringe with a sharp needle, which he uses to inject Gilligan with curare.
In the opening sequence it can be easily seen, after Kalani's canoe capsizes, that she could have easily maintained herself by leaning upon the overturned canoe, as her right hand rests gently upon it as she is in the lagoon. By the time Gilligan reaches her, she is laying across the canoe, with no danger of actually drowning but certainly in need of assistance.
In this episode Gilligan swims to save Kilani. However, in How to Be a Hero (1965), he had trouble swimming.
Mr. Howell states the he was captain of the boxing team at Vassar, but Vassar was exclusively a women's college until 1969.