People who had red hair and a flushed complexion were considered to have an excitable and hot tempered personality, so they were encouraged to marry someone with a different temperament, such as someone with jet-black or brown hair.
Someone with a thin, long-face was encouraged to marry someone with a round face.
A woman with the features of her father was told that she should marry a man with the characteristics of his mother.
A hyper and talkative person was encouraged to marry a shy and calm person.
And people were told to never marry someone with the same eye color as they have.
Laughing loudly, by either men or women, was considered inappropriate and rude anywhere. I don't see this one going over too well with modern people. Whispering and pointing was also deemed rude. I don't see this one going over well, either.
A person was not allowed to pry into the private affairs of others. Questions about how much money a person did or did not make or asking why a woman never got married or whether or not someone had a boyfriend or girlfriend were considered off limit topics. As nosey as people are today, this would be a stretch.
When men shook hands, a firm hand shake with the whole hand was appropriate. A man was viewed as a snob if he used a lifeless hand or merely three fingers. Also, the right hand was always to be used unless the right hand was somehow injured, then the left hand was acceptable, but one must apologize and say "Excuse my left hand".
A firm, warm, and cordial hand-shake for two to three seconds was respectful, but holding someone's hand for too long was a breach of etiquette, just as holding someone's hand too tight or shaking over vigorously would be.
Guests were expected remain at a party until the guest of honor left; leaving prior to the guest of honor's exit was unheard of. Once the guest of honor left, people were supposed to take a hint that it was time to go. People nowadays have no concept of this. They arrive when they feel like it and leave when they feel like it. If they want to show up late then they do, whereas showing up late or leaving too early then was unthinkable. Now, people leave a party early if they are bored, drunk, not drunk enough, or have another party to go to. Excuses, excuses nowadays.
13. The Appropriate Age for Marriage Was a Bit Different
A gentleman was not allowed to enter the presence of a lady in the dancing room if his breath or clothing smelled like strong alcohol or tobacco. I don't think that the people of yesterday would have cared too much for modern day clubbing.