- Lionel G. Wilson (Eustace) quit halfway through the series and was replaced by Arthur Anderson (II).
- Peter Fernandez had his face videotaped and inserted into animation for two episodes: "House of Discontent" (floating head) and "The Magic Tree of Nowhere" (the Tree).
- Courage's dialogue decreased after the first season. This is because the creators at Cartoon Network thought Courage "talked too much" and wanted his dialogue cut short.
- John Dilworth finally agreed to do a Courage series, and Cartoon Network originally wanted him to produce it from their Hanna-Barbera studio in L.A.. But Dilworth didn't want to leave his company Stretch Films in New York, so CN agreed to let him do the series from Stretch Films.
- The original season 2 finale "The Tower of Dr. Zalost" didn't air until after the season 3 premiere "Muriel Meets her Match"/"Courage Vs. Mecha-Courage" aired.
- Courage lasted for only 4 seasons, 52 episodes, and 13 episodes per season. Season 1 aired November 12, 1999 and ended June 29, 2000. Season 2 aired October 31, 2000 (had a 3 month hiatus between episodes 22 and 23) and ended January 11, 2002. Season 3 aired November 16, 2001 and ended July 9, 2002. Season 4 aired September 7, 2002 and ended November 22, 2002.
- A number of character designs (such as the Ship captain/Policeman) were reused. Often the only change was different hair color.
- The names Muriel and Eustace are taken from the middle names of Chandler Bing and Ross Geller of Friends.
- Throughout the series, the word DIL is somewhere in the background, after the creator John Dilworth.
- Tim Chi Ly, who voices the recurring character Di Lung, was one of the show's animators.
- This was the last series that veteran voice actress Billie Lou Watt worked on.
- This was voice director Peter Fernandez's favourite show that he worked on.
- Series creator John Dilworth placed major emphasis on audio effects: he wanted to use unconventional fresh music/sounds, in contrast to most shows developing stock material to use throughout their run. Dilworth wished to put any music/sound into the episode that emphasized the situation, whether it was tense, exciting or especially funny.
- Whenever Courage takes action to rescue his owner(s) from peril, a variation of the Mission: Impossible (1966) theme is heard playing. This theme varies with each episode, depending on what musical arrangement is being used in that episode.
- In "The Demon in the Mattress" has many connections with the film "The Exorcist" such as the Muriel spinning her head, puking on Eustace, performing an exorcism, and the spirit transferring from Muriel to Eustace. All the like in the 1973 film.
- The name Benton Tarantella is an obvious parody of director Quentin Tarantino while the character itself is likely a reference to George A. Romero who made a name for himself by directing independent zombie films.
- The Snowman's accent is similar to Sean Connery. He even introduces himself as "man...Snowman".
- The word "DIL" - in reference to director John Dilworth - appears twice in this episode. First as graffiti in New York City and second on the plug of the flying saucer.
- From 2010, a dedication appears at the start of "Robot Randy": "In memory of Peter Fernandez (who voiced Robot Randy), Go Speed Racer Go!" Fernandez, who served as the series voice director, was most famous for the anime Speed Racer (Dubbed) (known in the US as Speed Racer).
- In "1000 Years of Courage" it is established that Nowhere is in Kansas.
- The final TV (voice) performance of Arnold Stang.
- From 2010, a dedication appears at the start of "The Sand Whale Strikes": "In memory of Billie Lou Watt and Peter," and features photos of Astro Boy, Kimba the White Lion, and Speed Racer and Racer X. Voice director Peter Fernandez and Watt had collaborated on these animes in the 1960s.
- John Dilworth dedicated this episode to his brother Jim P. Dilworth, who had died of cancer.
