The biggest I can think of is that now, it’s quite common that guests are required to pay for their meals. It’s not the same as ”cover your plate” which is also common. Cover your plate is a mentality among guest to help the couple pay for the reception and want to offer a substantial cash gift (since we do not register here), while what I’m talking about is literally couples sending a request on their invites, saying how much the meal costs and if the guest want to attend they’ll have to send a cheque. To be honest, it’s so common in my area for guests to pay to attend the reception, that I didn’t know that ”free meals” existed before joining wedding boards ! Literally, I thought it was only in movies that people registered, paid everything for their guests, etc. It’s not the norm here, and it’s certainly not the norm in my family. My parents got married 3 decades ago and it was the norm in their social circle to have their guests pay, I don’t know, 30$ to cover the caterer’s fees.
Other than that, things that I know are done in weddings around here and nobody would be offended : cash bars, very common. Dollar dances, very common. Not having +1s, very common, childfree weddings (actually recommanded by wedding experts), not having a shower (considered gift-grabby). However, it is expected to have a bachelorette party and usually the bride’s friends will dress her up, bring her to different places where she will have to succeed challenges or play games in order to win money for her wedding.
Inviting people to different parts of the wedding is also common. Usually you invite your close friends and family to the wedding ceremony and reception, then for the dance (around 9pm) you can invite people you’re not that close too, but you’d like to party with : ex.: your coworkers, your cousins, your childhood friends, etc. And no, people are not offended, they’re happy to be invited and they’re ready to party !
To word my opinion as delicately as possible, I think there is some *entitlement* (probably not the best word, expectations ?) going on with etiquette, as to how guests expect to be treated, and it’s not the same mentality here. Overall, I think etiquette-weddings are really concerned about pleasing the guests, while weddings around here are mainly focussed around pleasing the newlyweds (not meaning that the guests are not treated well, but the difference of perspective obviously affects how *etiquette* is perceived and done, and allows things to be acceptable where it absolutely would be considered rude elsewhere, and vice-versa).