The Irish take their notion of “rounds” very seriously when out at pub or bar drinking. Everyone in your group is expected to buy a round for everyone else, and turning down a drink can sometimes be implied as insulting.
Jaywalking through the heavy Dublin traffic is commonly practiced by locals, but it’s an art that even the most daring travelers have a hard time mastering.
Check your bill to make sure to service charge is included. If the tip is not included, a 10%-15% tip is sufficient. It is not compulsory to tip taxi drivers, but €1 or €2 is a nice gesture.