There's a belief that Dobby broke a promise when he saved Harry Potter's life at Malfoy Manor, but that wasn't necessarily the case. Here's why.
Did anybody find mistakes or plotholes in Harry Potter movies? - Quora
A Harry Potter denier sits through every movie—do they play?
Harry Potter: 10 Plot Holes From The Deathly Hallows Parts 1 & 2 That Were Never Resolved
Why did Dobby help Harry in Deathly Hallows when he was told not to by Harry? - Quora
Why did Dobby help Harry in Deathly Hallows when he was told not to by Harry? - Quora
Rewatching Harry Potter: Deathly Hallows Part 1
The most eagerly anticipated book of the year, the grand finale of the Harry Potter series, is here. Harry must at last fulfill his destiny: to
Harry Potter and the Deathly Hallows [Unabridged 17-CD Set] (AUDIO CD/AUDIO BOOK) (Volume 7)
Why did Dobby help Harry in Deathly Hallows when he was told not to by Harry? - Quora
Harry Potter potential plot hole with Dobby? [Spoilers for Chamber of Secrets and Deathly Hallows Part 1] : r/plotholes
Why did Dobby help Harry in Deathly Hallows when he was told not to by Harry? - Quora