Darrell Evans hit 41 home runs with the 1973 Atlanta Braves (NL), and 40 home runs with the 1985 Detroit Tigers (AL). He was the first (I checked all players with 40 home run seasons before 1985).
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I have not been able to find the number of players that have done that but I would guess it has occurred many times. I was able to find out the only pitcher to have hit a grand slam in both leagues. Schoolboy Rowe hit one for the Detroit Tigers in 1939 and for the Philadelphia Philles in 1943. There have been two players in MLB history that have hit a grand slam in both leagues in the same season. In 1996, Greg Vaughn hit one for the Milwaukee Brewers, who were still in the American League, and for the San Diego Padres. And in 2000, Will Clark hit grand slams for the Baltimore Orioles and the St. Louis Cardinals.
No one ever has, at least in the major leagues, I think 15 or so have hit four.
No one (in the major leagues) hit home runs off Bob Feller in 1938.
Mark McGwire with 58. He hit 34 for the Oakland Athletics and then was traded to the St. Louis Cardinals where he hit another 24.
Henry "Hank Aaron was the first player to hit 715 homeruns. With his 715 home run he passed babe Ruth for first all time.