Some facial expressions are just priceless. Facepalm on "the woohoo talk" (will find the SS later)
Also, some differences:
Nady seeing Kaylee and Tyr, her parents, kiss: "Yuck!"
Kaylee seeing Nady kiss her BF: "That's the stuff!" Seriously, she looks like someone put some weed in her food.
When I had Kaylee's and Tyr's son marry his GF, it rained heavily - up until the moment when everyone walked inside to watch slicing the cake. Murphy's laws work in TS4 as well.