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.
On that last part, Raven's segment in particular. And Beast Boy singing the Japanese lyrics in English at the karaoke bar.
And the soundtrack itself is pretty awesome too.
Fanon: A popular theory is that the reason Raven is so snippy to Beast Boy in this film is that she was avertingNo Periods, Period. There's no evidence to contradict this, and so it's become Fanon.