All your points apart from the last one aren't really relevant. The film was never meant to be a direct copy of the books, its an adaptation. Many points throughout all the books have been dropped when converted to film, it doesn't take anything away from the films, it just means the producers decided for whatever reason they wern't appropriate.
But I do understand the Dumbledore point, maybe they didn't want his image to be changed like this in the film? Or maybe they just didn't have enough time to do it properly i.e. not a quick pointless reference.
I also though DanielRadcliffe's acting might of got better over the years... I was wrong