Plot hole: I can somewhat understand that in a kiddies' show all aliens can inexplicably speak English - but using Terranean (i.e.: Arabian) numbers as well? While Tetrax's computer uses alien runes, the readout on Gluto's holographic HUDs use Arabic numbers - somewhat a bit too deliberate a producer choice to emphasize intergalactic communication.
Ben 10: Secret of the Omnitrix (2007)
1 plot hole - chronological order
Directed by: Scooter Tidwell, Sebastian Montes
Starring: Tara Strong, Dwight Schultz, Paul Eiding, Meagan Smith
Genres: Action, Adventure, Animated, Comedy, Fantasy, Sci-fi
Continuity mistake: When Ben and Gwen are fighting off aliens on Incarcecon, right after the tetramand destroys the hoverboard, the Omnitrix is missing from Ben's wrist.