When the monkey throws the plate in the hut at the end, Professor covers his ears, Gilligan covers his mouth, and Skipper covers his eyes resembling the Three Wise Monkeys: Hear No Evil (Kikazaru), Speak No Evil (Iwazaru), and See No Evil (Mizaru).
When the Skipper and the Professor are discussing the nails made from explosive plastic, a close up of Alan Hale's left wrist is shown. It looks as if it were broken and didn't heal properly. This could the one he didn't tell anyone about after hurting it while filming an earlier episode.
At the communal table, Ginger says, "And thank you for the beautiful jewelry, Gilligan. I feel like one of the Gabor sisters." This is an allusion to the famous Gabor ladies (Magda, Zsa Zsa, & Eva) who were actresses in movies and on television. Eva (Green Acres) and Zsa Zsa were two out of three who were the most famous.
In the dentistry scene where the Professor and Ginger are attempting to put Gilligan under anesthesia Ginger appears to be wearing an engagement ring on her left hand.