Best musical TV mistakes of all time
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Continuity mistake: In the Season 1 episode "Bollo", Bob Fossil records Howard saying "Gorilla" on his talk box, which Howard does with a downward inflection at the end of the word. However, every time Fossil plays back Howard's "Gorilla", it has an upwards inflection at the end of the word.
Continuity mistake: During "Brand New Day", at one point, Dr. Horrible stabs a picture of Captain Hammer attached to a dartboard with a handful of darts, all right in the center of the picture. A few shots later as Dr. Horrible sits, suddenly the darts are far-more spread out. (It's in the background and can be hard to see, but it's noticeable.)
Continuity mistake: In the scene with the squires, right before their song, you'll see the guys laughing. There is a large, older guy sitting at a table. When you see him from the front (closer to Galavant's point of view), he's sitting about halfway down the table. But, when it shows him laughing in a close up from the other end (nearer the banner on the wall), he's sitting close to the end. This changes a lot during the scene.