The Animorphs theme tune/opening sequence tune is:
No turning back
No backing down
Nowhere to run
No solid ground
No place to hide
No-one to trust
No-one to help you when you're lost
There's only us
It's all in your hands
Hold back the darkness
Gotta take a stand
It's all in your hands
However this is not heard until the next episode.
If you look closely to the Dracon beams the Controllers are holding, its actually just flashlights, modified to look alienic.
By the books, Visser Three is only the rank of the Yeerk. His name is Esplin9466. The Andalite-Controller's name is Alloran Semitur Koras.
According to the first book, the monster that Visser 3 changed into is an Atrianian swamp monster that he found on a dying planet.
When Marco comes home, the monster movie his father is watching actually contains scenes from the Goosebumps episode 'The Werewolf of Fever Swamp', which is another TV series produced by Scholastic.
Red-Tailed Hawks are not native to the town the Animorphs are in, yet the hawk that follows the Animorphs home is not Tobias. Tobias acquired his morph from a injured hawk at Cassie's barn, how could this hawk be following them?
We find out that Tobias has a rougher life than the other Animorphs thought. He gets passed around between his uncle and aunt, and does not have any other family.
Marco acquires the DNA of a security guard but when he tries to morph, he fails. However, you do see his hand change briefly - and there's a watch on it. Watches are not part of human DNA.
By Book #2, The Visitor, Chapman's yeerk is Inis 226; therefore his code is 226.
When Jake, Marco, Cassie, and Ax encountered the fence when they were running from Visser Three, why didn't Ax just use his tail to cut the fence open?
When Ax is acquiring his human morph(specifically, when he is acquiring Jake and Marco), if you pause in the right spot, you can his that his hand only has 4 fingers, as opposed to the 6 that he should have.
Goof: When Visser Three's lackey is sucking up to him, the Visser partially morphs into some kind of creature. However, the Visser was in human morph, and they cannot morph from one form to another without reverting back to their original shape.
According to the Animorphs books, Hork-Bajir are unwillingly slaves of the Yeerks. In this episode, a human-controller presents a Hork-Bajir with his Yeerk removed to Visser Three in order to test a machine that will detect any creature without a Yeerk in it's brain. It seems strange that the now-freed Hork-Bajir would stand so still and calm after being infested for so long, not putting up any sort of fight and going along with the Yeerk instructions.
Going into the Yeerk pool unmorphed revealed their faces to the Controllers. Even if it was dark, they should at least known Marco's face since that Controller fired at him in plain sight.
After Marco hit the Hork-Bajir in the face with the oatmeal balloon, how did the lackey miss him? Marco was standing still and the lackey had a clear view but still managed to miss the shot.
Why would the 2 lackeys be scared of a lion when they both have Dracon beams? Shouldn't they be more afraid of what Visser Three will do to them knowing that they let one of the "Andalites" escape?
How did Tobias get into the Yeerk pool? The other Animorphs can go as ferrets but it's doubtful that Tobias as a hawk would squirm through that little ferret hole to get inside the Yeerk pool.
It's hard to believe that Ax doesn't know what "throw" means. Even if Andalites are a lot more advanced than humans, they should still know the word "throw."
Once again, there were Controllers with Dracon beams all around the Animorphs, but they chose to run as soon as they see a tiger, rather than shoot at it. There were many Controllers on the upper levels they were in no way of harm, but for some reason, they all ran away.
Since there were traces of water when Ax demorphed and remorphed, his hand/foot prints should have faded after a few prints. However, they stay wet all the way into the vent.