They are meant to emphasize the two particularly noticeable sounds that followed 01:56:820 (116820|0,116820|4,116820|3) - 01:57:420 (117420|2,117420|0,117420|3) -
They did not follow any sounds in the song, just only appeared at 2 beats per bar, in order to create some visual effects and make the patterns in this part look less monotonous, because they are in 1/4 of 200bpm, so they can be almost equivalent to rice when playing