Harry Potter and the Deathly Hallows: Part I

Snape was secretly working as a double agent for Dumbledore and the Order of the Phoenix. He revealed the relocation plans because Dumbledore had instructed him to ensure Harry was moved safely, this allowed Dumbledore to maintain Snape's cover as a trusted Death Eater while actually helping Harry escape. Snape's true loyalty lay with Dumbledore, who had died before the events of this film.

Snape's actions here follow the pattern established throughout the series where his true allegiances remain hidden.

Voldemort knew his own wand could not harm Harry because both wands contained phoenix feather cores, creating a magical connection that prevented the Dark Lord's wand from acting against Harry. By taking Lucius's wand, Voldemort hoped to bypass this protection and kill Harry during the attack.

Dumbledore left three personal gifts: Ron received a Deluminator that could locate others in darkness, Hermione received a copy of The Tales of Beedle the Bard containing hidden information about the Deathly Hallows, and Harry received both the Golden Snitch from his first Quidditch match and the Sword of Gryffindor, though the sword's location was not revealed in the bequest.

The Beedle the Bard book would later prove crucial in understanding the Deathly Hallows symbol.

R.A.B. is Regulus Black, Sirius Black's brother and a former Death Eater. He stole Salazar Slytherin's locket Horcrux from Voldemort, planning to destroy it but being killed by the enchanted inferi in the cave where he attempted to destroy it. He left a note declaring his intention to destroy the Horcrux.

Ron discovered this information while searching through Sirius's old belongings at Grimmauld Place.

The trio discovered that Mundungus Fletcher had sold the locket to Dolores Umbridge, who was working in the Ministry's Department of Magical Law Enforcement. They infiltrated the Ministry using Polyjuice Potion disguised as Ministry employees, fought through Death Eaters, and Hermione used the Department of Magical Transportation's Floo network to escape after retrieving the locket.

Gryffindor's sword is infused with basilisk venom, one of the few substances powerful enough to destroy a Horcrux. This was confirmed when Hermione realized that Harry's sword, which had killed the basilisk in Chamber of Secrets, had absorbed enough of the venom to gain the ability to destroy Horcruxes.

The basilisk venom was established in Harry's second year when he killed the creature.

The inscription 'I open at the close' refers to the moment when Harry would need to open the Snitch again, which happens at the very end of his life. When Harry finally opens the Snitch in the final film, the Resurrection Stone is revealed inside, allowing him to summon the spirits of his loved ones before facing Voldemort.

Harry caught the Snitch in his very first Quidditch match, making it a fitting container for something tied to his death.

The Deathly Hallows are three powerful magical objects created by the three brothers in Beedle the Bard's tale: the Elder Wand (unbeatable in battle), the Cloak of Invisibility (hides the wearer from death), and the Resurrection Stone (brings back the dead). According to legend, whoever possesses all three becomes the Master of Death.

The symbol appeared in Luna Lovegood's necklace and on the grave of Ignotus Peverell in Godric's Hollow.

The Deluminator Dumbledore left Ron had a hidden function: when Ron turned it, it emitted a light that could locate the other two in complete darkness. The Deluminator also contained a piece of Dumbledore's phoenix Fawkes, which guided Ron to their location in the forest after he had left.

The Horcrux locket amplified negative emotions, Harry was somewhat protected by his connection to Voldemort's mind, and Hermione had strong mental discipline. Ron's existing insecurities about his role in the trio and his feelings for Hermione made him particularly vulnerable to the locket's dark influence, causing jealousy and doubt.

Harry had previously used a shard of a mirror that once belonged to Dumbledore, hoping to see Dumbledore's face in it. Instead, Dobby, who had been freed and was working elsewhere, caught Harry's call for help in the mirror and traveled to Malfoy Manor to rescue the captives, using his house-elf magic to apparate into the magically secured building.

Harry had kept the mirror shard since Christmas in the previous year, waiting for Dumbledore's guidance.

Voldemort sought the Elder Wand because of its legend as the most powerful magical object ever created, unable to be defeated in a duel. Believing the wand would make him invincible, Voldemort retrieved it from Dumbledore's tomb, not knowing the wand's true allegiance could be won only through defeating its master, not simply possessing it.

Grindelwald had possessed the wand before Dumbledore defeated him decades earlier.

During the attack by Nagini (in Bathilda Bagshot's body), Hermione tried to Disapparate to escape but her spell went wrong and shattered Harry's wand, leaving him without a wand for much of the film. This forced Harry to use borrowed wands from Draco Malfoy later in Malfoy Manor.