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- Ghost of Christmas Past (single appearance)(photograph)(Doug Chippendale's disguise)
- Ghost of Christmas Present (single appearance)(photograph)(Doug Chippendale's disguise)
- Doug Chippendale (single appearance)(no lines)
- Christmas Spirit (only time mentioned)
- Chaunted Chanukah (only time mentioned)
- Ghost of Christmas Yet to Come (single appearance)(Doug Chippendale's disguise)
- Scooby (hyena) (single appearance)(no lines)
- Scrappy (hyena) (single appearance)(no lines)
- Punch or Judy (single appearance)(no lines)(unnamed)
- Gaggy (single appearance)(no lines)(unnamed)
- Sarah Shaker (single appearance)(no lines)
- Baby products salesperson (single appearance)
- Poison Ivy (mentioned)
- Doctor Thirteen (mentioned)
- Phantom Stranger (mentioned)
- Bargain Benny (photograph)
- Internal Revenue Service (mentioned)
- Miscellaneous Gotham City citizens (single appearance)(no lines)(thought bubble)
- Arkham Asylum van driver 1 (single appearance)
- Arkham Asylum van driver 2 (single appearance)(no lines)
- Gotham City
- Harley Quinn's giant mallet
- Harley Quinn's giant magnifying glass
- Joker Gas (thought bubble)
- Joker's detonator
- Batmobile (mentioned)
- Arkham Asylum van
|Humphrey Middleman||To take over the manager's job.|
|Sarah Shaker||Turned down for a raise.|
|Doug Chippendale||Turned down for a raise.|
|Bargain Benny||Store competitor.|
|Doug Chippendale as the Ghost of Christmas Past, Ghost of Christmas Present, and Ghost of Christmas Yet to Come||Revenge for not getting a raise.|
The following credits try to match how they are displayed in the comic as much as possible:
- Writer~ Sholly Fisch
- Artist~ Dario Brizuela
- Colorist~ Silvana Brys
- Letterer~ Saida Temofonte
- Cover artist~ Brizuela with Franco Riesco
- Editor~ Kristy Quinn
- Special thanks to~ Brittany Holzherr
- Harley Quinn created by Paul Dini and Bruce Timm
- This is the first Scooby-Doo! Team-Up Christmas special.
- Harley named her pet hyenas after Scooby and his nephew, Scrappy. In Batman: The Animated Series, Harley also had a couple of pet hyenas, named Bud and Lou, after Bud Abbot and Lou Costello.
- The title is a play on "Happy holidays."
- Harley Quinn and the Joker are based on their designs from Batman: The Animated Series, while Batman and Robin are still based on their The New Scooby-Doo Movies/Super Friends designs. This is different from the Joker's cameo in Template:SDT2, where he was based on his Silver Age/Bronze Age design.
- Harley refers to the Ghost of Christmas Yet to Come as Casper, after Casper the Friendly Ghost.
- None known.
Inconsistencies/continuity errors and/or goofs/oddities
- The last time Harley appeared in Gotham Ghouls, she claimed the Joker was always talking about how he wanted vengeance against Mystery Inc., but when Fred points this out to him, he doesn't remember them.
- Harley makes the connection between one of the ghosts and Doug Chippendale having baby powder on their feet, but she wasn't there when the baby products salesperson spoke about that (unless she was just standing in the background).
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