About 7 minutes into the show, one of the gamblers mentions the fact that the Mona Lisa was stolen from the Louvre 'Last year'. The only time the Mona Lisa was stolen was in 1911. The time period of the show appears to have taken place sometimes in the 1870's or 1880's.
Seventeen years after "The Art Lovers", Jack Kelly would go on to make his first appearance (as a guest star, he would later return as a regular cast member) on The Hardy Boys/Nancy Drew Mysteries, which costarred Shaun Cassidy, son of Jack (Roger Cushman).