Mixed Flats is a 1915 American silent short comedy film featuring Oliver Hardy.
According to a film magazine, "Jack and Bob, pals, have been out for a good time. Jack gets word that his wife is returning home from her vacation. He engages a servant who is, of course, a stranger to her. Minister Blake rents a new apartment in the same house with Jack. He writes his wife, who is also on her vacation, to come home at once and make no mistake, but to come to their new home at 222 Lemon street. Mrs. Blake is the first to arrive home. It being strange to her, she gets into the wrong apartment. Jack is told by the servant of his wife's return. When he discovers the mistake, he tries with Bob's aid to get rid of the strange woman before his wife returns, but they fail. When the wife arrives and accuses her husband of duplicity, they cause such a racket that the minister upstairs becomes so alarmed that he starts to investigate and discovers his wife. She explains to her husband, who apologizes and all is forgiven."