were there any art forms influenced by it?
In 1862 Charles Kingsley wrote a parody, the "Great Hippocampus Question", in the style of Lord Dundreary
Our American Cousin
In 1862 Charles Kingsley wrote a parody, the "Great Hippocampus Question", in the style of Lord Dundreary, and incorporated parts of this in "The Water-Babies" published in 1863. 

who was william h. seward? He was United States Secretary of State, and earlier served as governor of New York and as a United States Senator. where was he born? Village of Florida which political party did he represent? Republican Party when did he become the governor? January 1, 1839 has he done a campaign for any other leader? Yes, for  Lincoln when did he become the president of america? 1861 whom did he defeat in the election? UNANSWERABLE what were his views on politics? To resolve ongoing political power struggle between Whigs and Democrats. how did he die? He was assassinated. who killed him? John Wilkes Booth what was he? He was an American stage actor who assassinated President Abraham Lincoln what made him do so? He was against  President Lincoln's initiation on abolition of slavery in the United States when did it happen? April 14, 1865 where? Ford's Theatre was that an official visit? No, Lincoln and his wife went to attend the play "Our American Cousin" who were the characters in it? Lord Dundreary who played the title role? Joseph Jefferson what is the genre of the play? Farce
wiki:13519422
Our American Cousin [SEP] Popular culture
In 1862 Charles Kingsley wrote a parody, the "Great Hippocampus Question", in the style of Lord Dundreary, and incorporated parts of this in "The Water-Babies" published in 1863. In the 1950 film "All About Eve", Bill Sampson says to Margo Channing, "I've always denied the legend that you were in 'Our American Cousin' the night Lincoln was shot." "Our American Cousin" was adapted for the radio anthology program "On Stage" in 1953. In a move that earned him a rebuke from CBS management, director, producer, and actor Elliott Lewis aired it in the same hour as his show "Crime Classics"' episode "The Assassination of Abraham Lincoln".