This is probably the first time in the Scooby-Doo franchise where an episode makes a reference to a real social issue: drugs.
When this episode aired, Nancy Reagan's Just Say No campaign was prevalent; this campaign from the 1980s and early 1990s was part of the U.S. War on Drugs and it was used to discourage children from engaging in illegal recreational drug use.
In the beginning of the episode Red Herring gets pinched by a lobster after scaring Scooby and the gang. The lobster is bright red. Lobsters acquire their red color after being boiled. Live lobsters are actually a dark greenish-brown color.
How does Velma know this much about drugs that she can recognize them at first glance?
Freddie: Okay, Red, time to pay up. Red: No way, drip. You were working on another case. As far as I'm concerned, I don't owe you bozos anything.
(As Red walks away, Scooby trips him into the dolphin pool with his tail.) Red: (Skipper bops him up and down on its nose) Okay, I'll pay! I'll pay! (Skipper continues to play with him) Shaggy: Like, collecting bills is easy for Skipper and a pup named... Scooby: ...Scooby-Dooby-Doo!