The newly promoted side were punished by two second-half Stoke City goals on Saturday to leave them pointless following their opening two games of the Premier League season
Palace have opened their Premier League campaign following promotion with a 1-0 defeat to Tottenham and a 2-1 loss at Stoke City on Saturday.
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Charlie Adam and Ryan Shawcross were on target for Stoke, leaving Holloway to bemoan Palace's defensive deficiencies.
Holloway said: "It was tight and close and I was quite pleased with certain things.
"But with their first goal, I felt we got it wrong as a group. We didn't get organised.
"Then for the second one, Chamakh tried to toe-punt it out, they made a tackle and it has rolled straight to them.
"When you look at those goals, I am disappointed because we played better than that, but that is this level."
Palace are in League Cup action in midweek against Bristol City before welcoming Sunderland to Selhurst Park next Saturday.