обратить внимание на то, что его там не было(that she was less attentive, that he left early, that there was no one there, how he was dressed, how well she looked, etc., и т.д.)
заметить, что его там не было(that she was less attentive, that he left early, that there was no one there, how he was dressed, how well she looked, etc., и т.д.)