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When the gang capture the gremlin and are about to unmask him, Shaggy can be briefly be seen in his regular clothes instead of his stunt outfit. When Daphne unmasks the villain in the closeup, the sleeve is from her purple dress instead of her stunt outfit as well.
How are Scooby, Shaggy, Scrappy, and Daphne able to talk underwater without gurgling?
Shaggy is just wearing swimtrunks when he and Scooby go surfing. After the two are chased back to the beach by the giant shark, Shaggy somehow is seen with his regular clothes without so much as changing.
When the group is awakened to by the noise outside, Shaggy is wearing all-green pajamas. When they go outside to investigate, the pants parts of the PJs are maroon. Daphne is also wearing a nightgown as they go outside, as well as Scooby and Scrappy wearing their own PJs. When the villagers accuse Scooby of stealing the sheep and pursue the gang, they decide to go out the back way to avoid them. No sooner than they do this are the dogs without their PJs and Daphne and Shaggy are instantly in their regular clothes.