Factual error: Judging from how they're talking, and when they go, tickets to the concert go on the sale the same day as the concert. Since when did they start doing this?
Chapter 12 - S2-E2
Factual error: After Oro Dassyne has boasted about his fortress' defenses and the droid standung by him announces that he has spotted two Jedi approaching, Dassyne snatches the binoculars from him to take a look himself. Curiously, he holds them at a very different angle, i.e. he is not looking into the same direction the droid was looking, and still he spots the Jedi immediately.
Wavelength - S3-E8
Factual error: When Cyborg learns the hard way that Bumblebee can fly, his inbuilt Sonic Cannon rips a hole into the wall which glows with heat. A sonic weapon does not work with heat; it would shatter the wall, not melt it.
The Invisible Hand of Fate - S3-E3
Factual error: When Billy is in his first Underground Quiz Match, the host says at the start of the match "Jeopardy Rules apply," then starts with the first answer. Billy buzzes in with the correct question and wins it, however, Jeopardy Rules state that contestants may not buzz in before the host finishes reading. If they do, they lose their chance to buzz in first. (00:07:20)