Sean Dyche felt his side deserved more following a dominant display undone by seven second half minutes that won the game for Newcastle.
The Clarets led through Matej Vydra’s first half goal, and forced the visiting keeper into a number of saves before United substitute Alain Saint-Maximin led a fightback for the visitors.
The Frenchman set up one goal and scored another as Steve Bruce’s side climbed to within a point of the Clarets.
“I wasn’t disappointed in the performance because that was one of our more dominant performances of the season.
“I’m just disappointed that we haven’t got something from the game, but that’s football!,” mused Burnley boss Dyche.
“You have to turn the key moments in your favour, which we nearly did, but didn’t quite see it off.
“The second goal would have been important today, and we created enough to get it, but then two relatively soft goals; one which we normally block and the second when we get too deep, has allowed them to score.”
The goals came within two minutes of Saint-Maximin and another returnee, Callum Wilson, making their introductions for Newcastle.
“Their subs helped them, and with all due respect we haven’t got those type of players fit at the moment,” added Dyche.
“That’s been a challenge all season and there is a difference. We are putting on young players and trying to blood them and give them a chance and they put on seasoned pros who have been around the block a long time.
“That can affect a game and it did for two key moments. I don’t think they affected the rest of the game too much, but those key moments changed the game and that’s why those types of player are important, at any given time.”
Dyche, who revealed that absent goalkeeper Nick Pope could be fit for next weekend after jarring a shoulder at Southampton, added: “Overall, a lot of our defensive play today was very good.
"Bailey barely made a save, so there wasn’t too much wrong, other than two moments, and we worked their keeper well.
“It was an odd game today; two back-to-back actually - and the details that we normally get right at both ends of the pitch weren’t quite there, so we need to tighten up the details.”