Ben 10: Ultimate Alien/Trivia
- Author Existence Failure: Dwayne McDuffie had died partway through the series. Didn't prevent the show's continuation and eventual sequel series, though, as apparently all 52 episodes for UA had already been fully planned out before his passing.
- Creator Backlash: If this formspring [dead link] is to be believed, the person who designed Aggregor is embarrassed about him.
- Hey, It's That Voice!: Dee Bradley Baker uses his Klaus voice for ChamAlien and Prisoner Number 775.
- The Other Darrin: Zombozo is now voiced by John Dimaggio, rather than John Kassir.
- Recycled Script: The plot for "Inspector 13" seems fairly similar to the first series episode "Secrets", down to Ben's arm being at the risk of being cut off for his watch.
- Talking to Himself: Bivalvan, P'andor, Ra'ad, and Andreas are all voiced by Dee Bradley Baker. Galapagus is the only one not voiced by Baker, and is instead voiced by John Dimaggio, though it could count when Galapagus talks to Aggregor.
- Word of God: Dwayne McDuffie had started a new thread for Ultimate Alien and any remaining Alien Force questions… Up until he died, at least.
- Matt Wayne seems to have replaced him, as he was the one who confirmed the death of Pierce in "The Purge."