Despite the fact that he is both cold and cruel, the anime-only character Sorcerer Oacus's death is surprisingly tearjerking, even if his last words are to curse the heroes. It seems he may have been as much a victim of the Shadow Lord's machinations (if not more so) as everybody else.
Filler Arc: The anime (which adapted the first series) ran for sixty-five episodes. The books' plot finally ran out at episode fifty-two, and that included enough filler to make Thaegan into a recurring "boss"! Interestingly enough, Anime News Network reported that the Australian broadcast of the anime will consist of fifty-five episodes (52, plus the first three filler episodes). Meanwhile, only the first fifty-two have been seen in the U.S.. One wonders why they didn't just adapt the other two series.
Foreshadowing: In a minor way in the anime, occasionally during bits of narration the show will cut to a picture of the belt as it should be, with the gems in the proper order. Pay enough attention and you might work out the whole use the gems to spell "Deltora" twist before the characters do.
Interesting Situation Duel: Let's see, a battle atop some stairs, with an enormous drop on either side, a battle while standing on one Ak-Baba while being divebombed by another (while fighting Fallow), fighting while spelunking in a giant hive, not to mention some of Thaegan's duels.
Dain is more so in the anime. In which Neridah also flirts with Lief.
Running Gag: Barda at least has to be hit by the monster, get up dramatically, and beat them after some self-empowerment.
Sadistic Choice: In the anime: Thaegan has captured our heroes and transported them into her Mirror of Fear. Lief fights with his Evil Twin, Barda fights against what was thought as Brandine, and a caged Jasmine is forced to solve a difficult puzzle or she will be dipped into searing hot water for the monsters' stew. Luckily, the Belt's Ruby shows him the way out of the mirror.
Deltora is spelled with the first letters of the gems on the Belt of Deltora, arranged in the order King Adin the blacksmith managed to convince the Tribes to give him their Gems.
Dain deliberately chose his name to trick everyone else into thinking he's the heir, since the name's an anagram of Adin.
Single Line of Descent: By custom, every king or queen has only one child. This turns out to have been a plot by the Shadow Lord to make it easier to kill off the royal line. Ultimately, subverted as Adin (the first king) himself had several children, which allows a distant relative of the throne to show up as a plot point.
So Proud of You: Anna says this to Jasmine when her spirit is momentarily drawn back by the topaz.
Sorcerous Overlord: The Shadow lord fits this better than Evil Overlord alone since he is also a powerful sorcerer and infact derives much of his power from that fact.