Continuity mistake: When Harry brings Dudley home, just before he opens the door Petunia asks, "Diddykins, is that you?" and the plant fronds (beside the door) block the bottom of the photograph behind it, but in the next close-up the fronds are lower so the photo is more visible.
Continuity mistake: When Harry and Dudley reach the tunnel (out of the rain) Harry stands level with the "r" and "k" in the very large graffitied word "Stark", and Dudley is well past the large white graffiti to his right (viewer's left). The next shot, from the boys' POV, the empty tunnel is shown and on the left is the gratified word "Stark" and part of the white graffiti on the left, even though the two boys were actually just standing quite a bit farther into that tunnel. (00:03:00)
Continuity mistake: When Moody, Harry, Tonks et al. stand in front of 12 Grimmauld Place, their positions change. Harry and Tonks stand very close to Moody in shots facing them, but shots facing Number 12 they stand much farther apart, and in Harry's close-ups Shacklebolt now stands directly behind him, though in back shots Kingsley is behind Moody, and about 4-5 ft away from Harry. (00:10:25)
Continuity mistake: When Dumbledore is duelling with Voldemort at the Ministry, some tiles by Harry get broken. In a different shot of Harry in the same place, different tiles are broken. (01:54:10)
Continuity mistake: When Padfoot runs through the door at Kings Cross, it's open a fair bit (look at the top of the door to see the angle). When Harry runs through almost instantly after, it has closed a little more. (00:24:45)
Continuity mistake: As the students are departing the Room of Requirement and all thanking Harry, the group of students around Harry completely changes between shots. It's especially noticeable as the boy with shoulder-length brown hair passes Harry twice. (01:01:55)
Continuity mistake: During Mr. Weasley's celebrated arrival at 12 Grimmauld Place, in the wideshots facing that end of the table something tall is placed right beside the wood hutch, off to Ginny's left. In the shots facing the doorway, including when Harry joins them, there is nothing beside that hutch. (01:11:15)
Continuity mistake: When the Dementor lifts Harry off the ground in the tunnel, Harry's feet dangle beside the very large graffitied word "Stark", and then falls to the ground past the word with his feet near the "k". After it cuts to the closeup of his wand, Harry is now lying beside the "S", even closer to the Dementor, though he is trying to back away from it and reach his wand behind him. (00:03:55)
Continuity mistake: At the very start, Harry has his wand to Dudley. In this shot he is right by Dudley. When it goes dark, Harry and Dudley have moved apart a fair bit. (00:02:10)
Continuity mistake: When Harry, Ron, and Hermione go into the forest with Hagrid to see Grawp, Grawp frightens them and they run back and you see Harry is standing next to Ron and Hermione. In the next shot, Harry is standing about five feet away on the opposite side of where he was standing in the previous shot. (01:29:35)
Answer: Draco is shocked because a teacher is never allowed to hit a student, not for any reason. He never expected Umbridge to behave in such a manner.
raywest ★