Originally Posted by FBinNY

Every conventionally laced wheel is built with a multiple, repeating pattern of 4 spokes. 2 crossing on one flange, and a similar pair on the other one spoke hole away in the rim.

The 4 spoke motif is repeated a number of times depending on the number of holes, ie 8x for a 32h wheel. Everything should be uniform and repeat identically, usually with the spokes woven over/under at the last cross.

If your wheel has most, but not all, spokes woven over/under at the last cross, the non woven ones may have been replacements done by a sloppy mechanic.

In any case a whee is a model of repetition and uniformity, so either switch a few spokes if that'll solve the issue, or relace completely.