Sorry,my english is poor OTL
I hope this helps.
海外だとウインク率が上がります
→The time that Kamijo casts sheep‘s eyes at fans,is more when they in foreign country
About the laughing reason,i'm not sure...maybe just a laugh?
Masashi means the cat likes sleeping on its back. To a cat,it's a little weird...so they like watching it.
About Yuki’s speaking,it means that their works' quality is great.Every musical note in their works has its sense and they want to shake listeners' soul by the music.
Last, Kamijo means,there is still some sterotype about visual music.For example,people would say that they like korean artists but wouldn't like to say they like visual music.So they wanna change the situation.