In his portrayal, Tennant gave Barty the nervous habit of licking his lips, which Brendan Gleeson (Moody's actor) decided to go with. The movement was completely improvised on Tennant's part, but became an indicator for Barty Crouch Sr.
It's not obvious that Mad-Eye was an imposter but David Tennant improvised by licking his lips throughout the film, a trait Gleeson decided to mimic, signaling one of the small ways keen-eyed viewers could figure out the twist.
(gone undercover as Dark Wizard hunter Alastor "Mad-Eye" Moody) is the main antagonist of the fourth Harry Potter book, Harry Potter and the Goblet of Fire and its film adaptation. He is a Dark Wizard and an infamous Death Eater.
Voldemort and Wormtail then attacked Bartemius and placed him under the Imperius curse; with Wormtail's help, Barty stunned and then impersonated Alastor Moody throughout Harry's fourth school year. Because of the impersonation, Crouch was basically living a double life through his time at Hogwarts.
In the film version, Barty Crouch Jr. has the habit of licking his lips when threatened, in a snake-like way, to which he occasionally shows while under the disguise of Alastor Moody. This action led to him giving himself away to his father following the second task of the Triwizard Tournament.
In Harry Potter and the Goblet of Fire, Dumbledore has appointed Alastor Moody as the D.A.D.A. teacher and, of course, we find out that was not Moody, but was Bartemius Crouch pretending to be Moody for that year and that Moody was prisoner during that time.
Draco and his wife, Astoria Greengrass, decided early on that they would raise their son without pure-blood beliefs. In Harry Potter and the Cursed Child, Scorpius Malfoy (Draco's son) was taught to treat Muggles and half-bloods with the same respect that he would treat any wizard or witch.
After Lord Voldemort destroyed the fragment of his soul residing in Harry, Harry seemingly lost the ability to speak Parseltongue, about which he was glad and relieved. Over the next twenty-two years, he never attempted to speak the language, presuming that it had died with Voldemort.
The ability to speak Parseltongue is usually inborn; a wizard is born being able to speak Parseltongue, and those who are not born with the ability cannot normally learn the language (although, according to the author, Dumbledore may have learned to understand it, and in Harry Potter and the Deathly Hallows, Ron learnt ...
Parseltongue itself is not evil; it is simply a language. However, its association with certain dark wizards has led to misunderstandings and stigma. How do you become a Parselmouth? Being a Parselmouth is usually a hereditary gift.
If you lick your lips frequently, they can end up being dry and flaky, and even worse, cracked and bleeding. Ouch! Also, if you're an habitual lip licker, you might develop something called lip licker's dermatitis, which is an eczema-like skin inflammation that affects the area around your lips.
“I just think it's common sense,” he tells me, when I ask why he – unlike so many other men in the spotlight – actually sticks his neck out to talk passionately about feminist issues. “I mean, I think it goes beyond any sort of political response. It's just the natural way of things and the natural way to be.”
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
Mundungus' betrayal caught Moody by surprise and gave Voldemort enough time to cast the Avada Kedavra and kill Mad-Eye Moody. After he was brutally killed by Lord Voldemort, Moody's dead body tragically fell from his broom.
Severus Snape eventually joined the ranks of Lord Voldemort's Death Eaters. His actions as a Death Eater are largely unknown, though he quickly became an important Death Eater in Voldemort's inner circle. He was the spy responsible for informing Voldemort about the prophecy foretelling his downfall.
Lucius Malfoy was one of the many Death Eaters who denied their allegiance to Voldemort after the end of the First Wizarding War and therefore would be a perfect example of the kind of person Barty Crouch Jr. hates the most.
However, Harry Potter proves to be one of the worst detectives when it came to Alastor "Mad-Eye" Moody being Barty Crouch Jr. in disguise. The character has so many hints and tells that point to him not being who he says that even Harry Potter should have noticed.
Barty uses a Confundus Charm to confuse the Goblet of Fire, so it selects Harry's name as the fourth contestant from an unspecified school. The plan works, as Harry follows through with the competition against Cedric Diggory, Fleur Delacour, and Viktor Krum.
The reader finds out Dumbledore knew beforehand because he calls in the house elf Winky before Crouch changes back from Moody form. How did Dumbledore know beforehand? He guessed. It involved Harry telling Dumbledore that Barty Crouch Sr.
During the 1994–1995 school year, Barty Crouch Jnr (disguised as Alastor Moody) transformed student Draco Malfoy into a white ferret and bounced him up and down, as punishment for attempting to attack fellow student Harry Potter from behind, earning Draco the nickname of "The Amazing Bouncing Ferret".
