Plotholes (spoilers)
Season 1:
Family Hotel Accommodations -
It made no sense for a rich couple and three teenagers to be in a one bedroom hotel suite.
Season 2:
Tanya -
1. She's worth $500 million and has no bodyguard.
2. She has no employees (money manager, lawyers, housekeeper, personal chef, chauffeur, etc.) whom she could phone in an emergency to tell them to alert police. She's a VIP American, the police would be swarming the yacht to avoid an international incident. The ditzy assistant doesn't count and I doubt if she would've been hired.
3. She didn't hire a detective to track her husband. No background check before marrying him.
4. The ditzy assistant doesn't contact the hotel to see if Tanya's ok and have them alert the police.
5. Tanya's ditzy assistant galavanting off with guys she just met instead of working. She should have stayed on the yacht.
BTW, her whining about not getting a chance to enjoy Italy when she's not on vacation, but supposed to be working. Not a pothole, but an annoyance.