Sperg was seen on the pile of junk on the island where Jimmy's mom put Grim, Billy and Mandy, but Sperg was not seen escaping or leaving. But, in "Billy & Mandy Moon the Moon", he is seen again.
For a second when Grim, Billy, and Mandy were being placed back on the ship by Jimmy's mother, the ship appeared slightly smaller and Grim, Billy, and Mandy seemed slightly larger.
The last time Dora made an appearance, she was sucked into her mystical box from Pandora's Lunchbox. How did she escaped?
Grim: (seeing Billy alive) Ah, I knew it was too good to be true.
Mandy: (to Billy) Stop right there, you waste of DNA.
Billy: Hey! Mandy's head gave birth to Irwin!
Billy: Hey, Mandy! Did you know your nostrils flare when you're angry?
Grim: She doesn't have nostrils, she doesn't even have a nose!
Billy: A man can dream...
Piff makes another appearance in the episode "Beware of the Undertoad."
Hector Con Carne from "Evil Con Carne" makes a cameo in this episode once again.
Cerberus makes another appearance in this episode.
This marks the second appearance of Captain Deadwood.
Dora from Pandora's Lunchbox made cameos in this episode.
He is based on undertow, which is a rip current.
The aerobics instructor in Waking Nightmare was a knock off of the aerobics instructor, Richard Simmons.
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