Stephen Dobbie gave Palace the lead but they were pegged back by a goal from Jordan Rhodes as the game ended all square. However, Holloway was unhappy regarding the treatment of striker Glenn Murray.
Hollway told reporters: "He (Murray) could have scored today. Without being shoved 10 yards. Am I exaggerating or not? Without being shoved completely as you're going to head it, onto your back, he would have took the penalty.
"Without them cheating at that point, because that's what it is isn't it? You can't defend properly so you shove somebody over and the ref didn't see it, what more do you want him to do?"
Palace are fifth in the Championship with two games to play this season.