ר"י said; the Omnipresent should have mercy on you, etc. - רבי יהודה אומר המקום ירחם עליך כולי
According to ר' יוסף prayers are helpful all year only according to ר' יוסי, but not according to the others (except before יו"כ) while according to ר' יצחק according to everyone צעקה is always effective.
ר"ת maintains that the correct name (of this תנא) was שכנא (and not שבנא) for שבנא was a רשע. While the ר"י maintains that his name was שבנא, for there was also another שבנא who was not a רשע.