Koko ni..sanjou!
You just knew I'd have to show up here,
Sorry to contradict you, Orz, as we're almost friends now, but you've made a mistake.
You said..
"There's also the matter of him truly believing that he was more powerful than Trunks after the Time Chamber training, when Trunk's raw power was incredibly high. He just lacked the training and finesse to correctly use SSJ2 instead of USSJ.
Vegeta surely would have sensed Trunks' greater power if he wasn't so blinded with his own ego and new achievements."
Vejita knew what Trunks was doing, and that Trunks thought he was stronger then Vejita.
Trunks made a mistake, and continued to pump his training into pure strength, whereas Vejita balanced his training between strength and speed, as he should have.
Trunks never outclassed Vejita in any way, and in fact, if they had ever truly faced off against one another, the same thing that happened to Trunks when fighting Perfect Cell, would've happened against Vejita--Vejita was faster in his 'Super Vejita' form, then Trunks was in USSJ.
After Vejita is healed by Kururin's sensu bean, and returns to find Perfect Cell gone, and Trunks standing there sulking, he comments to him, in both the english and japanese versions, 'You were foolish to think you could beat him, silly boy.' (To that effect)
Vejita may act blind and arrogant, but he's also a very intelligent warrior, such as outbluffing Android 20. He does make mistakes, but this isn't one of them.
As for what Death Biscuit says about the animators having inconsistencies, he is definitely right. There are many instances of mistakes regarding the SSJ forms, such as in the #4 movie about the SuperNamek, they refer to Goku as being SSJ, but his hair isn't golden. He has the gold aura, but his hair is in his normal black form, and the SSJ aura noise isn't present. (I believe this movie also takes place before the end of the Frieza saga, so he couldn't have been SSJ anyways.)