Things like that are for readers to enjoy when they notice them, as you did, and it's fun to share the noticing with other people. You can just write something

Things like that are for readers to enjoy when they notice them, as you did, and it's fun to share the noticing with other people. You can just write something along the lines of 'Enjoyed the piece, was your title a reference to X? X was inspired by Y!'. That way don't accidentally come across as a messageboard nitpicker but as the erudite reader that you are.