Harry potter... newest movie...?

i felt like they left out a lot like hermione and ron being prefects? am i rite? also, was it just me, or did i detect some jealousy in ginny in the scene where harry and cho are walking and hermione's like "hagrid's back!" and he leaves. then you see ginny kinda nugde her hard in the shoulder as she pes by. was that just me? also one more thing. did you detect that ron was jealous that the giant guy was hitting on hermione??? and he was like "just leave her alone!" was that just me?