- 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.
- 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.
- Follow the Leader: The Scarlet Witch started with her usual powers. In Ultimates 3 it turns out that she's a Reality Warper, so strong that she could bring dinosaurs from the past! This is probably the result of Avengers Disassembled and House of M, which redefined her powers in the main continuity in the same years the first volumes of the Ultimates were produced.
- 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