May one talk between kaddish and mussaf? Our minhag is to take off the t'fillin then on rosh chodesh. Others, like Belz chasidim, put on their rabainu tam t'fillin, say some davenning like shma, and ...
Recently I saw in Halacha that it is inappropriate to have the sermon right before Kaddish of Musaf as it is considered a Hefsek. Yet many Shuls do just that and have the sermon right before Kaddish ...