Continuity mistake: In the sewers under the Opera House, a bunch of rats rush out of a duct at the gang and it startles Shaggy. He backs up into the guard rail and knocks a large chunk of it loose, which falls away, leaving a large gap in the railing. Scooby quickly grabs Shaggy and pulls him away. Then the gap is shown again, and it is suddenly only about half the size it was in the previous shot.
Picture added by Quantom X
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