- Awesome, Dear Boy: Mark Millar actively pushed for Marvel to create an Ultimate Marvel version of the Avengers, of which he was a huge fan.
- Big Name Fan: When Mark Millar and Bryan Hitch made the ultimate version of Nick Fury, they based him on the likeness of the actor Samuel L. Jackson. When Marvel started the MCU years later, Jackson was an obvious choice. But when they asked him, they did not need to explain what was it all about: Jackson was already a big fan of the Ultimates.
- Executive Meddling: Millar was not allowed to actually use the name "Avengers" due to Marvel believing that the brand recognition was dead in the water at the time. Millar even stated that Marvel tried to offer him an Ultimate Wolverine book in an attempt to dissuade him.
- Schedule Slip: Four storylines were illustrated by Bryan Hitch (Ultimates, Ultimates 2), Joe Madureira (Ultimates 3) and Frank Cho (New Ultimates) all suffered from this.
- In Hitch's case at least, this can be mostly excused due to his Awesome Art
- Unintentional Period Piece: The comic makes it very clear that George W. Bush is the President of the United States. Along with commentary on The War on Terror, various talk shows having characters make appearances on them (such as David Letterman, who would retire not long after his appearance here), and references to celebrities who were popular at the time (like Freddie Prinze Jr.), the first two Mark Millar penned volumes are unmistakenly set in the 2000s.
- What Could Have Been:
Trivia / The Ultimates