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Phineas and Ferb (2007) - 30 mistakes in entire show
Continuity: In the episode 'One Good Scare Ought To Do It', when Phineas is carried into the air inside the haunted house, there is an aerial shot showing the Fireside Girls and Isabella, who is wearing a yellow sash like the other scouts as she shouts, "Phineas!" There are two problems here. First, Isabella wasn't wearing the sash before at the haunted house, until this particular shot. Also, between the shots before Phineas falls, her sash disappears, reappears and then disappears again. It reappears after Phineas falls, and Isabella says, "Quick, everyone! Sashes!"
Continuity: In the episode "One Good Scare Ought to Do It", Candace arrives at Jeremy's house and is wearing a belt. (It's very clear as she yells "These are designer jeans!") After Susie's attacks, when Jeremy comes out Candace is on the ground with the dog still attached to her rear end and the belt has disappeared. In the next shot of Candace, the belt has returned.
Continuity: In the scene where Doofensmirtz talks about how the sign blocks his view of other people's pain and misery, his window faces the sign. Then in the next shot where the laser blasts the sign, the Doofensmirtz evil inc. logo is facing the brick sign and the windows are facing the other way.