It depends on how much other candidates made them laugh and if that was a graded part of the interview, and you would actually have to know the lengths/numbers of the thousands of interviews to arrive at an average. But to respond seriously, there is no way to know. The people on these panels volunteer their time for what they regard as a serious purpose, but there is enjoyment to be had in talking to young people aspiring to service as a military officer. If they had the time to spare, they are happy to engage. If your Spidey-sense didn’t pick up on body language indicating annoyance, impatience, amusement of the kind that indicates you were funny for the wrong reasons, you are probably fine.