While everyone is climbing up the stairs, Rocky is nowhere to be seen. He then reappears when everyone is donnly Snowball, Pencil, Blocky, Firey and Ice Cube; Eraser's screaming voice can be heard, though it could be Blocky screaming.
When Match kicks her maroon ball in anger, Match is above Bubble in the scoreboard, even though Match's points were deducted and went below Bubble. The error is still visible when Ice Cube returned her maroon ball.
When Blocky appears before the intro, there is nothing behind him, but when he falls backward, Firey, Ice Cube, three recommended characters, and water appear.
At 0:22, it shows that Remote was recommended by punx192, but it's actually recommended by simondomino.
At 1:38, when Announcer threw a fish to Bubble, she didn't pop.
When Eraser said "That dumb Speaker Box didn't like my ball", his ball was red, not maroon.
At 2:58, Announcer glitches a little bit to the right.
Blocky is floating for 2 seconds.
During the contest, the scoreboard displays incorrect rankings and numbers multiple times, so much so that annotations are in the episode itself acknowledging the errors. For example, you could see that Rocky has 31 points and Ice Cube has 30. Rocky's score is supposed to be over Ice Cube's score but instead it's the other way around.
Also, at 4:24, Ice Cube was put into the Danger Zone, but subsequent displays of the scoreboard don't include Ice Cube in the Danger Zone.
At 5:07, when a red ball hits Firey, it didn't catch on fire.