Matt Phillips started in a striking role for the R’s, in the absence of Charlie Austin, but he was isolated for large periods of the match.
Huddersfield dominated possession in the contest, but the introduction of Sebastian Polter and Jay Emmanuel Thomas helped turn the match around.
And Hasselbaink said: “The players were really trying, I can’t fault them for that.
“Huddersfield played ever so well in the first half. They kept the ball, played it around us and we couldn’t get close [to them].
“We had to change the formation to get a better platform and we did. We started to look a bit better but we didn’t hold the ball up front.”
Hasselbaink’s draw with Huddersfield was highly disappointing, as they were outplayed for so much of the contest.
It leaves Hasselbaink still looking for his first win since being appointed at Loftus Road.
The 43-year-old has now been at the helm for five matches, but four draws and a defeat has seen the pressure on him start to rise.
QPR are now in 13th place in the Championship table - seven points away from the play off spaces.