Whattt??? That's ridiculous and really... I wouldn't blame the prospective employee. Yes, he's only human, but he's also the boss. The one who sets an example. If he doesn't have his shit together he can't expect his employees to and this is just all around bad business. It's called making a schedule. Does he even arrive to work on-time? Because I wonder. He doesn't sound all that reliable either, which is something you need if you're new. When you have an interview, you're expected to be there, no? I doubt he'd understand your situation if you said something like "oh my mom stopped by". You're not on any personal relationship with this dude so why should his flimsy excuses excuse this kind of behavior. From a boss, no less. :| I dunno, maybe I'm just anal retentive.

LOL that's creepy. I wouldn't want my boss's cell number to talk about fun stuff. That would creep me the hell out. I'd run out of there like someone's about to set off a bomb. I don't go to work to make friends. I go to work to do my job. I expect to be paid for the hard work and long hours. I don't want to be in a weird uncomfortable friendship with my boss where he can't pay me and says "it's ok cuz we're friends!"
Hella creepy. No, no, no. shudders (maybe I just don't like that kind of thing because I'm an introvert, I dunno) No matter how you play that in your head he just comes off as a creepy creepy guy and just a whole lotta no going on there.

Yeeahhh is he doing any work at all? I'd expect his workload to be double since no one else is there to do it. Is he really going to pay you, and on time? Is he going to make excuses? You don't know this guy from timbucktwo and he's acting like your BFFs. That's creepy as fuck. If he can't remember something you'd think he'd know he can't remember something. Cell phones have aps. Since he is a corporate business I expect him to have a nice phone. All of them do. So there's an ap called CALENDER where you can throw in dates you've got for things, hell there's even paper ones you can write on! AMAZING!
Even if you can't afford a receptionist, a phone is a handy little device with a lot of stupid useless aps that'll help a dumbass as does a piece of paper. I think this guy is lost on life. He doesn't know what he's doing anymore. "busy" is no excuse not to keep appointments. What if this was a customer? What then? He's potentially lost one. Why make an ad for a job you won't remember exists a week later?
Such idiocy and creepiness all rolled into one.