I think an asterisk by the Homerun records would be appropriate.
I remember when people thought there should be an asterisk next to Roger Maris 61, since he played a full 18 games more than Babe Ruth.
When the American League expanded in 1961, the season was changed from 154 games to 162. In 1927, when Ruth hit 60 home runs, he played in 151 of the 154 games. In 1961, Maris' record-breaking year, he played in 161 games.