French language Q&A Forum

I was watching an interview with Amira Casar on Cinéma & Moi, and the host asked her, "Qu'est-ce que vous aimeriez voir au cinéma plus souvent?"  She answered, "Des scènes d'amour réussies... souvent c'est trop prude...c'est trop...il y a draps....j'y crois pas."  I guess my question is, why j'y crois pas here instead of je le crois pas?  Can both be used there?  Does j'y crois pas mean something different from je le crois pas?  (I don't believe it, don't believe them, it's not believable???)

Is ‘Pour mes prochaines vacances’ (writing challenge B1 My Next Holiday) because the writer assumes there will be more than one more holiday? (ie, the next in an expected future series). Would it be ‘Pour mes vacances prochaines’ if the next was thought to be the last?

What would be the difference between "J'ai lu beaucoup de livres" and "J'ai lu de nombreux livres"? 

The solution has sa belle robe vert but the text and the audio have sa belle robe verte. I was marked down for verte.