In the beginning of "Three's a Crowd," Emmy drew Cassie as red, but at the end of the episode when Emmy added herself to her picture, she was red and Cassie was blue.
After Nicki says that she had a great time with Emmy and Cassie in "Three's a Crowd"," Emmy's red and purple crystals magically vanish and reappear in her hands.
In "Three's a Crowd", after Cassie is finished talking to Quetzal about Emmy, the bird feed that Quetzal put on the window sill magically disappears.
When Ord is talking about who did what to design the kite in "Three's a Crowd," Wheezie's leg is green for a few seconds.
When Max yells for the Doodle Fairies to open the gates in "A Crown for Princess Kidoodle", Cassie is missing her Dragon Badge.
In "A Crown For Princess Kidoodle," Zak states that he and Wheezie have a map of every knuckerhole in Dragon Land. Hopefully, it's more accurate than his information was in "A Picture's Worth a Thousand Words."
Emmy: I'm so full. I don't think I'll be able to eat again for three days.
Mom: Emmy! Max! Dinner!
Cassie: Wait a minute! But, what about... (trips over rock) Oh, no! The crown! (crown lands on Princess Kidoodle's head)
Cassie: Silver gates so big and wide, we need to enter, so move aside.
Cassie: Um, Ord, shaking the gates won't help.
Wheezie: Step by step
Zak: We're moving on
Max: We're all right here
Emmy: Till your fears are gone.
Zak: When we work together...
Zak and Wheezie: ...two heads are better than one!
Zak: Eww, a purple goo bog. What do we do?
Wheezie: Walk right through.
Zak: But then we'll get all sticky and dirty. I don't want to look messy for Princess Kidoddle's crowning.
Emmy: Me neither, I'm wearing my favorite party dress.
Zak: We have a map that shows every knuckerhole in Dragon Land.
Ord: (talking about the gates) Come on, open up! Please? We'll miss the royal feast, and I'm hungry!
Wheezie: You know, for once Zak, I agree with you. I think it'll be safer to walk.
Even though Princess Kidoodle is crowned Queen of the Doodle Fairies in this episode, she is still referred to as "Princess" in future episodes.
"A Crown For Princess Kidoodle" is the first episode in which Max and Emmy get all dressed up in fancy suits.
Three's A Crowd was the name of a 1979 game show, hosted by Jim Peck. A revival was attempted by the Game Show Network in 1999, hosted by Alan Thicke, but that also proved to be short-lived. Not to be confused with the 1984 ABC Three's a Crowd, a revival of the sitcom Three's Company, starring the late John Ritter as Jack Tripper.
It seems like Cassie has a habit of talking to herself when she's upset. Another example is back in "Bad Share Day."
Nicki has a diamond-shaped, orange dragon badge. It's not known what it glows for.
Dragon Tunes: "Count on a Friend"