Told his servant to give the guts of a goose he was cooking on a holiday to the cat; since they would be disgusting, he had had them in mind from the day before: Shabbat 142b-143a
Drank wine all day on the day before Pesach, to increase his appetite: Pesachim 107b-108a
What he ate for the meal on Pesach night: Pesachim 114b
Said that learning should refine one's actions, and that learning must be with a pure intention: Berachot 17a
Rava [or perhaps Rabbah] was expert in recognizing Babylonian currencies, but he did not feel that he was expert enough to distinguish between types of blood for certain rulings: Niddah 20b
Series of Stringencies Enacted to Prevent Violation of Shabbat: Shabbat 141a
Rava would not allow his servant to use a human wall to transport barrels through an area on Shabbat, after the first time he had done so; Rava was concerned that the people would be aware they were serving this purpose, and so it would be forbidden: Eruvin 44b
Rava's approval when his brother, Rav Seuram, took Jews who were sinful and made them into avadim: Bava Metzia 73b