Release Date Change: The episodes "Risky Business", "Kids in the Hall", "Crib Notes" and "Hypnot O Zed" were going to air on August 6, 2011, but were delayed at the last minute to August 27.
"There Will Be Shrieks" was going to air on October 22, but was pushed forward one day later to make room for a Sponge Bob Squarepants rerun.
Screwed by the Network: The biggest example yet. Originally Adored by the Network in 2009-2010, the second season had its episodes delayed for quite a long time. It took four years - with no episodes throughout most of 2012 and all of 2013. In addition, no third season was announced, canceling the show all together.
Talking to Himself: Jeff Bennett does the voices of many recurring characters, including Boog and Agent Johnson, who argue with each other in "A Bopwork Orange". He also voices Man-Arctica and his Arch-Enemy, the Global Warmer.
The Pilot Episode "Wizboy" was to have a scene in the hallway right before the lunch scene. Also, some dialogues were longer.
For "Pick a Nose", the boys' preparation scene was longer, such as Fanboy painting his head. Also, the boys originally got dirty by crawling in a dumpster, while in the episode, they repeatedly sniff a dirty Chuggy.
Two scenes in "Trading Day", one involving Yo sneaking away with Chum Chum in her mouth and Kyle with his own Mechatech. These were removed for an unknown reason.
The episode "I, Fanbot" had an alternate opening where the boys watch Kyle make a potion with his Lil' Warlock Kit, and Fanboy is caught drinking from it before burping up a smoke skull. This was removed in the final version as it was deemed too harsh and unsettling, and skipped to the scene where Mr. Mufflin announces the test, and Fanboy is caught making a weird face instead.
Originally, Oz removed Fanboy's brain first; in the episode, he takes out the robot's brain first. Also, the robot didn't speak originally, he was given a voice near the end of production.
There was an extra scene involving the three boys giving out a note in the hallway in the script and storyboard for "Excuse Me".
"Present Not Accounted For" originally had Dollarnator giving Chum Chum a joke-of-the-day calender; in the final episode, he had no lines, and his gift remained unknown. Also, Kyle's dramatic monologue originally started right when he was introduced, and was a little different.
The Halloween Episode "There Will Be Shrieks" was originally going to end with the boys not getting their taste back, and Chum Chum's grapes from earlier falling out of the sky into his bowl.
Kyle's first scene in said episode is much different in the storyboard than the episode.