When showing the labels on Safari Joe's cages, the "G" in "TYGRA" is upside-down.
Safari Joe learns that Tygra is unable to swim when he is visible, and forces him up to his chest in water which causes him to choke so he is unable to function, but in "The Fireballs of Plun-Darr", he was able to swim completely underwater easily for about a foot after he had lost his whip and thus his invisibility.
In Latin America, the goof about Tygra being unable to swim already described, was even bigger as the translation of the dialogue between Safari Joe and his robot just said: "Tigro no sabe nadar" that means "Tygra can't swim (at all)".