All through the episode, Flora's bracelets disappear and reappear.
Most of the time when Techna is flying in this episode, her digital wings aren't there.
When Stella is talking to the pixies after the monster is destroyed, her hairband is blue, but a second later, it's back to the usual purple.
When there's a bird's eye view of the island where Bloom and Tecna make the oxygen shield, you can see the evil tree inside the shield. When they do closer shots, the tree is outside, like it was supposed to be.