Scarlets flanker John Barclay rued the missed opportunities and how moments of ill-discipline cost his side in their 19-15 loss to Leinster at the RDS Arena on Friday.
The Scarlets got off to the perfect start with a try for centre Hadleigh Parkes in the opening minutes, followed up by a conversion for young outside half Dan Jones.
Leinster's only try came early in the second half but their fly-half Ian Madigan kept the home side in the game.
"We saw a little bit of indiscipline and we coughed up the ball too cheaply at times," said Barclay.
"It's great to come here and get a bonus point but we're pretty disappointed to lose that game.
"Last year we came here and probably had the worst form of the season, it's probably one of the hardest places to come and play, they've got a great record here."
Losing by four points ensured that the Scarlets didn't leave the RDS empty-handed taking a vital losing bonus point to keep them within two points of new table-toppers Connacht.
"The fact that we're disappointed is good but it's these games at the end of the season that you look back and think 'what if', so it's a bit disappointing," added Barclay.
With the PRO12 taking a back seat for the next fortnight as the European Rugby Champions Cup gets underway Barclay looked back at the opening block with positivity having won six of the seven opening games.
"It's encouraging," he said.
"We have plenty to work on but were winning our games and it's going ok."
Scarlets take on Northampton Saints on Saturday 14 November in the opening round of the Champions Cup before returning home to the Parc on Saturday 21 November to take on Racing 92.