Villan: Sarah Jenkins
Reason: To stop her brother's robot from running the carnival.
When the robot is behind Shaggy in the hall of mirrors, Shaggy says "Scooby Doo, where are you?" But seconds earlier he was telling him the mouse was only little. He knew where Scooby was then.
The eerie robot music that plays whenever Charlie the Robot walks around or does something is borrowed from The Jetsons. Similarly, the circus-style music heard a couple of times in the episode was borrowed from Squiddly Diddly.
The first episode, and one of very few, in which there's no real 'villian' or crime being committed.
Velma, as usual, seems to lose her common sense along with her glasses. When she and Scooby are riding in the out-of-control kiddie car, she mistakes Charlie the Robot for a traffic cop. This is an abandoned amusement park!
The reflection of Scooby's dog tag in the funhouse mirror is not a reverse image, although it should be.
When Scooby and Velma are trapped on the runaway go cart, they are finally stalled by a huge mess of cotton candy. Cotton candy could not stop a go cart in real life.
When Sarah cuts the wire to the magnet, no one notices. That would be nearly impossible since she had to reach over Mr. Jenkins to cut the wire.
Much of this episode is used in the opening credits of the series.
(The gang is inside the caretaker, Mr. Jenkins', house talking with him about the weird things at the park)
Freddie: Well, we saw a very strange character running around out there.
Shaggy: He was like WEIRDO!
Scooby: (agreeing) Reah!
Sarah: (not believing them) Fiddlesticks. Besides us there is no one else on this island.
Mr. Jenkins: Sarah's right. Maybe the moonlight was playing tricks on you.
Shaggy: Man I tell ya-
Freddie: Let it go Shaggy. Sorry to have bothered you, Sir. Let's go gang.
(cut to them outside the house, disappointed they didn't believe their story.)
Freddie: How do you like that for small talk?
Velma: We can't go home now. We know we didn't imagine all those kooky things that happened.
(after a bit they go back to the beach and wait for what seems like an hour. Suddenly the lights come back on in the park along with the music, to everyone's shock)
Freddie: (shocked) Oh oh!
Daphne: Here we go again.
Velma: I think we've stalled.
Fred: (referring to the frightening run-away go cart trip) Wow, at least you're safe. What luck!
Velma: What do you mean luck? We didn't have a bit of trouble! Ask Scooby!
Scooby: Train coming!
Velma: Train coming? I told you I can't stop. The train will just have to look out for itself!
Shaggy: (after their boat sinks) Don't panic, I'll save ya!
Velma: (referring to the knee deep water in the Tunnel of Love) Thanks Shaggy, but why don't we just walk out?
Shaggy: What do they call this? A steak-out? I'd rather have a steak-in. Like a sirloin steak; in me that is!
Velma: I sometimes think that you would rather eat a pizza pie than solve a mystery.
Shaggy: OK, then. Vote for pizza pie. (raises hand)
Scooby: (raises hand) Pizza pie.
Shaggy: Man! That guy is faster than a speeding bullet!
Charlie the Robot appears in Scooby Doo Night of 100 Frights.
Villian: Mr. Jenkins
Reason: He built Charlie to run the carnival, but the robot went haywire after Jenkins's sister interfered.
The mouse that stands near the fun-house mirror (and creeps out Scooby) seems to resemble Pixie the Mouse from the "Pixie and Dixie" segments on The Huckleberry Hound Show.