- Creator Backlash: The reason why a Laugh Track/"drawn in front of a live studio audience" bit is used in the episodes "Please Retire" and "Under the Sea Monster" is because Thurop Van Orman felt that they weren't the strongest of the episodes.
- Whilst many of the crewmembers on Flapjack such as Patrick McHale and Pendleton Ward have spoken fondly about their time on the series, others like Alex Hirsch and Ghostshrimp have been more openly critical; the former felt that the show's Depending on the Writer approach to storytelling and Off-Model animation made it unfocused and distracting, whilst the latter - a freelancer who was unfamiliar with the studio environment - found the work ethic in some of the staffmembers to be sloppy and unprofessional, and a poor reception to one of his pitches led to him being axed from the show.
- Cross-Dressing Voices: The Dock Hag is voiced by Daran Norris, Lady Nickelbottoms by Jeff Glen Bennett, and Dr. Barber's mother by Kevin Michael Richardson.
- Descended Creator:
- Thurop Van Orman voices the main character Flapjack.
- Writer and storyboard artist J.G. Quintel appears as a live-action captain in the short "Captain and Toeneil".
- Invisible Advertising: Like most of the animated series left on Cartoon Network during the infamous CN Real era, this show was hardly advertised after its first season (outside of appearing in advertisements for the Har Har Tharsdays and Monday Nights blocks). There wasn't even an advertising of its Series Finale, not even as a new episode.
- The Other Darrin: In the Brazilian dub, Flapjack was originally voiced by Gustavo Pereira, before later being voiced by Alexandre Moreno. Also combined with The Other Marty, as CN had Moreno redub the episodes with Pereira's voice, most likely for consistance.
- Screwed by the Network: The show's timeslot changed several times over the course of its run, it rarely, if ever, got any reruns, and as mentioned on the main page, unless you subscribed to Thurop's DeviantArt account, you wouldn't've known when the Series Finale aired!
- Short-Lived, Big Impact: Flapjack was a modest success at best while it was on the air, and it only lasted for 3 seasons of 46 episodes. However, two crew members of the show went on to create shows that would fuel a renaissance for not just Cartoon Network, but for Western Animation as a whole, which had experienced a slump in popularity throughout the latter half of the 2000s.
- What Could Have Been:
- The Wiki Rule: Flapjack Wiki Harbor.
- Write Who You Know: An In-Universe example, when Peppermint Larry starts putting on puppet shows, they revolve around "Pancake" and "Captain K'neecaps" and how lame they are.
Trivia / The Marvelous Misadventures of Flapjack