Dotty's math doesn't add up when she figures out how much money they'll need for goodies at the circus. Her first total is $17.35. Then she breaks down the cost just for peanuts: twelve bags for a total of $4.20, or 35 cents per bag. When she's reminded that they should buy peanuts to feed the elephants she adds two bags of peanuts, which would cost 70 cents. But her new total after adding the two bags of peanuts is $20.15
When Woofer is complaining about having to carry the bone, his mouth moves but we hear Whimper's voice.
Whatever county Clue Club is set in, it must be very large. In Episode 2, Sheriff Bagley is investigating a jewel theft on the ocean coast. In this episode it's shown that his jurisdiction extends to a ski resort in the mountains.
This episode establishes that Dotty and Pepper are sisters.