Three things that foreigners will likely consider unique about the dining setup in Thailand:

1. Sugar in Soup- Yep, that jar you see on tables containing white crystals isn’t salt, that’ll be sugar. And if you’re properly Thai, you’ll dump 3-4 heaping spoons of that sugar into your soup. While this isn’t great for diabetes, it means Thais never have to share their soup with foreigners.
2. Toilet Paper on Dining Tables- napkins? Nah. Toilet rolls. Don’t ask me, I’m a farang and I’ll never feel comfortable wiping my mouth with toilet paper.
3. No Knives- knives are not part of cutlery in Thai dining, if there’s a knife on your table, you’re at a farang oriented dining establishment. Bite it, bludgeon it with your spoon or saw away with your fork, but you won’t find a knife to cut it. You learn to order dishes that don’t call for much cutting if you’re having a business lunch and feel struggling with cutting might damage your image.