It’s still to be discussed wether she called him Dave or not, but last year, she did a panel and at some point, she told the now famous “Neck brace prank story” and she may have referred to him as “Dave”. I’ll let you judge by yourself. Here’s the link, the story starts at 16:20. To me, she did say “Dave” 🙂
There’s actually probably many of them. We only saw two of them really kissing. One is the deleted scene, the other one is in the bloopers, and god knows how many of them remain unreleased. We don’t know which one they filmed first, it’s probably none of them. No one knows what happened in their mind for those unscripted kisses except that they were “just goofing around.”