"The Rash sided with the opponents of the Rambam in their disputes." and "reproached Rambam for not having indicated the Talmudic sources in his Mishna Torah" - possibly a reference to one of the letters Rabbeinu Shimshon sent to the Ramah on the subject of the Rambam dispute. In this letter, the Rash rebukes the Rambam for not checking ...
In the book "Shu"t Ach Tov Leyisrael" by Rabbi Efraim Kachlon, he has a siman discussing the potential Avodah Zara status of Islam, and he mentions this claim about the Rogatchover (pg. 134-135):
"ואשר ע"י השנ'י שכתב לערער ולומר שיש לישמעאלים דין עוע"ז הוא במה שראיתי בספר הרוגצ'ובי (עמ' 157), וזתו"ד שם פעם נסבבה שיחה עם ...
You might want to consider the Time4Mishna site which methodically goes through all the mishnayos in shas with a full range of overviews and key terms etc.
So for example in Zeraim, if you look at Mishna Berachos here, you will note:
and a summary
I hope this helps!