- To Sweeney Todd, in the form of Muriel's "crazy barber" nephew Fred. The horror is negated somewhat by his cheerful rhyming and the fact that in the end, he's mostly harmless.
- Also, stock footage of King Ghidorah, a recurring nemesis of Godzilla, appears several times throughout the series.
- The ending to the original short features Courage holding open the iris out to comment "This shouldn't happen to a dog!". The iris then closes on Courage's nose, causing him to yelp in pain. This gag is a reference to the classic Bugs Bunny short "Hare Ribbin'". Which is further played with in the sequels. "This still shouldn't happen to a dog!"
- Also, there are figurines of Dilworth's short The Dirdy Birdy in the house.
- The twin raccoons from "Campsite of Terror" have the same design as Avery, a character from Ace & Avery, a segment on Big Bag which Dilworth worked on prior.
- Nedd from Noodles & Nedd (a series of Sesame Street segments by Dilworth) often appears, most commonly as a framed picture in the Bagge house lounge room.
- The word "Dil" often appears, referring to Dilworth.
- The episode "The Mask" contains a few overall elements and themes of gritty exploitation and noir, especially the violently abusive gang leader boyfriend.
- Benton Tarantella.
- And his partner, Von Volkheim.
- An episode where Courage, Muriel, and Eustace are brought 1000 years into the future, where everyone is a banana, as a kind of inverted Shout-Out.
- "Wait! I sense a disturbance in the Force!"
- In "The Ride of the Valkyries", a rather dim-witted bird is called the Norwegian Blue.
- One scene also has a poster in the background featuring The Powerpuff Girls.
- The entire episode "The Demon in the Mattress" was one to The Exorcist.
- A lot of things the Snowman has said or done are a Shout-Out to Sean Connery and James Bond.
- Muriel picking up playing the sitar after an early episode may be a shoutout to Star Trek: The Next Generation, and how Captain Picard picked up playing an alien flute after "The Inner Light".
- The episode "Serpent of Evil River" features a serpent named Carmen who loves opera music. Guess what opera music they used to attract the serpent?...
- One episode is titled "Courage vs. Mecha-Courage". Just take a guess what that's a shout-out to.
- In "The Duck Brothers" they have a pretty blatant shout-out to The Three Stooges.
- The way Robot Randy talks is pretty similar to Christopher Walken.
- In "King Ramses' Curse", Courage at one point turns into a sinking ship, which is accompanied by a familiar flute theme.
- At one point in "Little Muriel," Muriel repeatedly chants "I want an easter egg!" recalling a little terror in the Bugs Bunny short "Easter Yeggs."
- At the end of "Courage in the Big Stinkin' City", Bushwit falls and gets trapped inside a tuba in a similar manner to Giovanni Jones in the short "Long-Haired Hare".
- The titular hunchback from "The Hunchback of Nowhere" entertains himself by ringing bells, similar to what Quasimodo did for a living.
- The scene in "Remembrance of Courage Past" where Courage screams into the Veterinarian's stethoscope references the Tom and Jerry short Mouse Trouble, where Jerry does the same thing to Tom.
- The Stitch Sisters, villainous Conjoined Twins in a stark black outfit, strongly resemble the similar villains from The City of Lost Children, a film whose aesthetic is very similar to Courage's.
Shout Out / Courage the Cowardly Dog