These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Raditz is a car salesman and has a very dopey voice. He is also strong enough to kill Cell instead of Gohan.
Dodoria seems to act like a child.
King Cold looks forward to meeting Frieza's friends instead of helping Frieza kill the Z-Fighters. After Mecha Frieza's death, King Cold says "Thank you for killing Lord Freezer Brain and leaves, which is extremely unlike his character.
Doore from Cooler's Revenge and Return of Cooler has a personality similar to Nappa's from Dragon Ball Z Abridged. Not only that, they are voiced by the same exact person. Both of them annoy the hell out of their masters.
Any sudden appearance of "Parenting with Vegeta". It even interrupted Vegeta during the Saiyan Saga retelling. He got pissed.
ANY appearance of King Cold in Episode 38. Trunks even comments that his presence is more random than a flashback about Vegeta.
Episodes 26 and 53.
Episode 26 has to do with Cell and Frieza setting up a bomb to destroy the Earth. Then it goes from Piccolo getting confused about human genders, Gozar punching a stuffed duck, Dabura doing women's aerobics, Piccolo getting a Big Mac, Vegeta's flashback about his mustache phase, then leading to the bomb blowing up. First comes a dud Parenting with Vegeta, then when the bomb continues, it turns out the bomb itself was a dud too. It turns out it was Vegeta' birthday. Frieza says that him and Cell would never set up a bomb.
Kyle Hebert: "This is Kyle Hebert, I'm the voice of Teen Gohan from Dragon Ball Z. Kinda heard through the grapevine that you've been, uh, talking smack about my character. I just like to tell ya that you suck. Gohan happens to be a great character. In fact, one of the greatest characters ever created! And you'd be lucky if he gave you the time of day, dude! So why don't you make like a tree, and get outta here! Get a life you loser! Oh, and thanks for watching!"