Nixon will frequently do this with the hihat— do the open note on 1 in the first measure, and on the & of 1 on the second measure. This pattern occurs on the fade out:
This cowbell part, played by a percussionist, is sort of interesting; it is basically the same rhythm as the standard Go Go bass drum pattern, but with the halves of the measure reversed. If that bass drum rhythm were the “clave” of Go Go music— you could make a case for that— then the cowbell would be reversing clave; a no-no in music that is actually clave-based.
This same rhythm happens to be used in Brazilian music, but as far as I know there is no direct connection between the styles.
Here's the track: