Harry Potter and the Order of the Phoenix (2007)

Continuity mistake: At 12 Grimmauld Place, when Harry and Sirius are in the room with the Black family tree, as Sirius says, "My parents with their pure-blood mania," the area of the wall with both Sirius's and Andromeda's names and burned off pictures is quite visible (as in other shots as well). Bellatrix's name is beside Andromeda's (her sister), but there is no picture over Bellatrix's name banner in this shot (only branches and leaves), nor in any other shot, except in the previous close-up, as Sirius says, "My deranged cousin," where there is a picture of Bellatrix over her name. (01:13:25)

Super Grover ★

Dolores Umbridge: You applied first for the defense against the dark arts post, I believe?
Professor Snape: Yes.
Dolores Umbridge: But you were unsuccessful?
Professor Snape: Obviously.

Trivia: The director and other persons of importance had cut Kreacher out of the film. JKR told them that she couldn't tell them what to do, but the final film wouldn't make sense if they didn't introduce Kreacher in this one. Five minutes later, Kreacher was back in.

Question: When Umbridge has Harry, his friends and the Slytherin students in her office, she asks Harry if he was going to warn Dumbledore. When he says he wasn't, she responds by slapping him in the face. In the background, Draco has a look of shock on his face. Considering the fact that he hates Harry, why would he react this way?