Some footage of the exploding volcano came from the 1968 film "Krakatoa: East of Java".
According to [ink=nm0338936] on his dvd commentary for this episode, the movie "The Devil at 4 O'Clock (1961)" was the inspiration for this episode.
According to Tom Greene on his dvd commentary, the shot of Jake Stephen Collins flying the principle cast members off the island in the Goose was a shot intended for the next episode "Mourning Becomes Matuka (1983)" but couldn't be used because Roddy McDowall was unavailable for that episode. Notice that Sarah Caitlin O'Heaney is wearing a different outfit. See Goofs.