Hugh GrantHugh Grant was originally cast as Gilderoy Lockhart but was forced to withdraw at the last moment because of scheduling conflicts. Alan CummingAlan Cumming was also considered.
While chatting with the Grangers at the bookshop, Mr. Weasley says, "I understand that other muggles are afraid of you." Both Hermione's parents are dentists.
Nurses were drafted into the production when an outbreak of head lice occurred among the young cast.
As Harry enters Prof. Dumbledore's study, a portrait of Gandalf the Grey is included in the collection of the great wizard paintings. It is above the doorframe and slightly to Harry's right.